{"id":11733,"date":"2023-08-30T08:35:38","date_gmt":"2023-08-30T00:35:38","guid":{"rendered":"http:\/\/www.szryc.com\/?p=11733"},"modified":"2023-08-30T08:35:38","modified_gmt":"2023-08-30T00:35:38","slug":"cool-mosfet%e7%9a%84emi%e8%ae%be%e8%ae%a1%e6%8c%87%e5%8d%97","status":"publish","type":"post","link":"http:\/\/www.szryc.com\/?p=11733","title":{"rendered":"COOL MOSFET\u7684EMI\u8bbe\u8ba1\u6307\u5357"},"content":{"rendered":"
1 \u5bfc\u8bfb<\/p>\n
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2 \u53cd\u6fc0\u5f0f\u8f6c\u6362\u5668\u5de5\u4f5c\u539f\u7406<\/u><\/p>\n
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\u5728\u5f00\u5173\u7ba1\u5173\u65ad\u9636\u6bb5\uff0c\u4e8c\u6781\u7ba1D\u6b63\u504f\u5f00\u901a\uff0c\u628a\u4e4b\u524d\u5b58\u50a8\u5728Lp\u4e2d\u7684\u80fd\u91cf\u91ca\u653e\u5230\u8d1f\u8f7d\u7aef\uff0c\u6b64\u65f6\u526f\u8fb9\u7ebf\u5708\u7535\u538b\u88ab\u7b9d\u4f4d\u7b49\u4e8e\u8f93\u51fa\u7535\u538bVo\uff0c\u7ecf\u531d\u6bd4\u4e3an\u7684\u53d8\u538b\u5668\u8026\u5408\u56de\u539f\u8fb9\uff0c\u4f7f\u7535\u5bb9Cp\u7535\u538b\u88ab\u5145\u7535\u81f3nVo(\u6781\u6027\u4e0b\u6b63\u4e0a\u8d1f)\uff0c\u521d\u7ea7\u7535\u611fLp\u4e24\u7aef\u7684\u7535\u538b\u88ab\u7b9d\u4f4d\u81f3nVo\u3002\u5f53Lp\u7eed\u6d41\u653e\u7535\u7ed3\u675f\u540e\uff0cD\u53cd\u504f\u622a\u6b62\uff0cLp\u548cCoss\u3001Cp\u53d1\u751f\u8c10\u632f\uff0c\u5bfc\u81f4Cp\u4e0a\u7684\u7535\u538b\u964d\u4f4e\u3002<\/p>\n 3 \u529f\u7387MOSFET \u7684\u7b49\u6548\u5206\u6790\u539f\u7406\u56fe<\/p>\n MOSFET\u662f\u7535\u538b\u63a7\u5236\u578b\u5668\u4ef6\uff0c\u529f\u7387MOSFET\u7684\u6e90\u3001\u6f0f\u7535\u6781\u4e0d\u5728\u540c\u4e00\u5e73\u9762\u5185\uff0c\u4e5f\u79f0\u4e3a\u7eb5\u5411MOSFET(\u5373VMOSFET),\u5176\u5177\u6709\u5f88\u591a\u4e0d\u540c\u4e8e\u6a2a\u5411MOSFET\u7684\u7279\u70b9\uff0c\u4e00\u822c\u628a\u529f\u7387MOSFET\u770b\u4f5c\u4e00\u4e2a\u7531\u6a2a\u5411MOSFET\u9a71\u52a8\u7684\u7eb5\u5411JFET\u5668\u4ef6\uff0c\u56fe6\u663e\u793a\u4e86\u529f\u7387MOSFET\u5305\u542b\u5bc4\u751f\u5668\u4ef6\u5728\u5185\u7684\u7b49\u6548\u539f\u7406\u56fe\uff0c\u5176\u4e2dLg\u3001Ld\u3001Ls\u5206\u522b\u4e3aMOSFET\u7684\u6805\u6781\u3001\u6f0f\u6781\u3001\u6e90\u6781\u7684\u5f15\u7ebf\u7535\u611f\uff0cRg\u4e3aMOSFET\u5185\u90e8\u6805\u6781\u7535\u963b, Cgd\u3001Cgs\u3001Cds\u4e3aMOSFET\u5bc4\u751f\u7535\u5bb9\uff0cD\u4e3a\u5bc4\u751f\u4f53\u4e8c\u6781\u7ba1\u3002\u7531\u4e8e\u5bc4\u751f\u5668\u4ef6\u7684\u5b58\u5728\uff0c\u4f7f\u529f\u7387MOSFET\u5728\u53cd\u6fc0\u53d8\u6362\u5668\u7535\u8def\u7684\u5de5\u4f5c\u548c\u5206\u6790\u53d8\u5f97\u590d\u6742\uff0c\u7279\u522b\u662f\u5728\u53d8\u6362\u77ac\u95f4\uff0c\u5bc4\u751f\u53c2\u6570\u7684\u5206\u6790\u663e\u5f97\u66f4\u4e3a\u91cd\u8981\u3002<\/p>\n \u56fe6 MOSFET\u5305\u542b\u5bc4\u751f\u5668\u4ef6\u5728\u5185\u7684\u7b49\u6548\u539f\u7406\u56fe<\/p>\n \u8d85\u7ed3 MOSFET \u4e0e\u5e73\u9762MOSFET\u7684\u533a\u522b<\/p>\n \u56fe7\u663e\u793a\u4e86\u5e73\u9762MOSFET\u7684\u622a\u9762\u7ed3\u6784\u548c\u7535\u573a\u5206\u5e03\uff0c\u4ece\u4e2d\u53ef\u4ee5\u770b\u51fa\u5e73\u9762MOSFET\u7684\u51fb\u7a7f\u7535\u538b\u53d6\u51b3\u4e8e\u6f02\u79fb\u533a\u7684\u63ba\u6742\u5ea6\u548c\u539a\u5ea6\uff0c\u7535\u573a\u5206\u5e03\u7684\u503e\u659c\u5ea6\u4e0e\u6f02\u79fb\u533a\u63ba\u6742\u5ea6\u6210\u6b63\u6bd4\u3002\u56e0\u6b64\uff0c\u5982\u9700\u83b7\u5f97\u8f83\u9ad8\u7684\u51fb\u7a7f\u7535\u538b\uff0c\u5c31\u9700\u8981\u8f83\u539a\u4e14\u8f7b\u63ba\u6742\u7684\u5916\u5ef6\u5c42\uff0c\u4f46\u662f\u4eceMOSFET\u7684\u5bfc\u901a\u7535\u963b\u5206\u5e03(\u5982\u56fe8)\u4e2d\uff0c\u53ef\u4ee5\u770b\u51fa\u5916\u5ef6\u5c42\u7684\u7535\u963b\u5360\u4e3b\u8981\u90e8\u5206\uff0c\u5c24\u5176\u662f\u9ad8\u51fb\u7a7f\u7535\u538bMOSFET\u3002<\/p>\n \u56fe7 \u5e73\u9762MOSFET\u7684\u622a\u9762\u7ed3\u6784\u548c\u7535\u573a\u5206\u5e03<\/p>\n \u56fe8 MOSFET\u5bfc\u901a\u7535\u963b\u5206\u5e03<\/p>\n \u7efc\u4e0a\u6240\u8ff0\uff0c\u5e73\u9762\u9ad8\u538bMOSFET\u7531\u4e8e\u7ed3\u6784\u7684\u539f\u56e0\uff0c\u5bfc\u901a\u7535\u963b\u8f83\u5927\uff0c\u5bfc\u81f4\u5bfc\u901a\u635f\u8017\u8f83\u5927\uff0c\u800c\u4e14\u5f00\u5173\u901f\u5ea6\u4e5f\u53d7\u5230\u4e00\u5b9a\u7684\u9650\u5236\uff0c\u5f00\u5173\u635f\u8017\u4e5f\u6bd4\u8f83\u5927\uff0c\u8fd9\u663e\u7136\u5df2\u7ecf\u4e0d\u80fd\u6ee1\u8db3\u76ee\u524d\u65e5\u76ca\u8981\u6c42\u8282\u80fd\u548c\u63d0\u9ad8\u8f6c\u6362\u5668\u6548\u7387\u7684\u7535\u5b50\u5e02\u573a\u9700\u6c42\u3002\u57fa\u4e8e\u5e73\u9762MOSFET\u7684\u7f3a\u70b9\uff0c\u8d85\u7ed3MOSFET\u5e94\u8fd0\u800c\u751f\uff0c\u56fe9\u7ed9\u51fa\u4e86\u8d85\u7ed3MOSFET\u7684\u622a\u9762\u7ed3\u6784\u548c\u7535\u573a\u5206\u5e03\uff0c\u4e0e\u5e73\u9762MOSFET\u7684\u622a\u9762\u7ed3\u6784\u4e0d\u540c\uff0c\u8d85\u7ed3MOSFET\u91c7\u7528\u4e86\u8f83\u6df1\u7684P\u578b\u67f1\u7ed3\u6784\uff0c\u5e73\u9762MOSFET\u7684\u5916\u5ef6\u5c42\u51e0\u4e4e\u88ab\u4ea4\u66ff\u7684N\u578b\u548cP\u578b\u534a\u5bfc\u4f53<\/u>\u8584\u5c42\u66ff\u6362\uff0c\u5e73\u9762MOSFET\u4e0e\u8d85\u7ed3MOSFET\u7684\u7b49\u6548\u5668\u4ef6\u6a21\u578b\u5982\u56fe10\u6240\u793a\u3002<\/p>\n \u56fe9 \u8d85\u7ed3MOSFET\u7684\u622a\u9762\u7ed3\u6784\u548c\u7535\u573a\u5206\u5e03<\/p>\n \u56fe10 MOSFET\u7b49\u6548\u5668\u4ef6\u6a21\u578b<\/p>\n \u8d85\u7ed3MOSFET\u5782\u76f4\u65b9\u5411\u4e0a\u63d2\u5165P\u578b\u533a\uff0c\u53ef\u4ee5\u8865\u507f\u8fc7\u91cf\u7684\u7535\u6d41\u5bfc\u901a\u7535\u8377\uff0c\u5728\u6f02\u79fb\u5c42\u52a0\u53cd\u5411\u504f\u7f6e\u7535\u538b\uff0c\u5c06\u4ea7\u751f\u4e00\u4e2a\u6a2a\u5411\u7535\u573a\uff0c\u4f7fPN\u7ed3\u8017\u5c3d\uff0c\u5f53\u7535\u538b\u8fbe\u5230\u4e00\u5b9a\u503c\u65f6\uff0c\u6f02\u79fb\u5c42\u5b8c\u5168\u8017\u5c3d\uff0c\u5c06\u8d77\u5230\u7535\u538b\u652f\u6301\u5c42\u7684\u4f5c\u7528\uff0c\u4f7f\u5668\u4ef6\u7684\u51fb\u7a7f\u7535\u538b\u4ec5\u4f9d\u8d56N-\u6f02\u79fb\u533a\u7684\u539a\u5ea6\uff0c\u800c\u4e0eN-\u533a\u548cP\u9631\u533a\u7684\u63ba\u6742\u6d53\u5ea6\u65e0\u5173\uff0c\u4e14\u8fd9\u79cd\u7535\u8377\u8865\u507f\u8d8a\u5145\u5206\uff0c\u51fb\u7a7f\u7535\u538b\u8d8a\u9ad8\u3002\u7531\u4e8e\u63ba\u6742\u6d53\u5ea6\u7684\u5927\u5e45\u63d0\u9ad8\uff0c\u5728\u76f8\u540c\u7684\u51fb\u7a7f\u7535\u538b\u4e0b\uff0c\u5bfc\u901a\u7535\u963bRon\u53ef\u4ee5\u5927\u5927\u964d\u4f4e\uff0c\u751a\u81f3\u7a81\u7834\u7845\u9650;\u540c\u6837\uff0c\u5728\u76f8\u540c\u7684\u51fb\u7a7f\u7535\u538b\u548c\u76f8\u540c\u7684\u5bfc\u901a\u7535\u963bRon\u4e0b\uff0c\u53ef\u4ee5\u4f7f\u7528\u66f4\u5c0f\u7684\u82af\u7247<\/u>\u9762\u79ef\uff0c\u4ece\u800c\u51cf\u5c0f\u6805\u7535\u8377\uff0c\u63d0\u9ad8\u5f00\u5173\u901f\u5ea6\uff0c\u964d\u4f4e\u9a71\u52a8\u529f\u7387\u548c\u5f00\u5173\u635f\u8017\u3002<\/p>\n 4 \u53cd\u6fc0\u5f0f\u8f6c\u6362\u5668\u4ea7\u751f\u7535\u78c1\u5e72\u6270\u7684\u539f\u56e0\u548c\u4f20\u64ad\u65b9\u5f0f<\/p>\n \u7535\u78c1\u5e72\u6270\u4e3b\u8981\u662f\u4f20\u5bfc\u5e72\u6270\u548c\u8f90\u5c04\u5e72\u6270\uff0c\u4f20\u5bfc\u5e72\u6270\u662f\u5728\u8f93\u5165\u548c\u8f93\u51fa\u7ebf\u4e0a\u6d41\u8fc7\u7684\u5e72\u6270\u566a\u58f0\uff0c\u6765\u6e90\u4e8e\u5dee\u6a21\u7535<\/u>\u6d41\u566a\u58f0\u548c\u5171\u6a21\u7535\u6d41\u566a\u58f0;\u8f90\u5c04\u5e72\u6270\u662f\u901a\u8fc7\u7a7a\u95f4\u8f90\u5c04\u7684\u5e72\u6270\u566a\u58f0\uff0c\u6765\u6e90\u4e8e\u7535\u573a\u53d1\u5c04\u548c\u78c1\u573a\u53d1\u5c04\uff0c\u5b83\u4eec\u4e4b\u95f4\u53ef\u4ee5\u76f8\u4e92\u8f6c\u6362\u3002<\/p>\n 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\u5305\u542b\u5bc4\u751f\u5668\u4ef6\u7684\u7b49\u6548\u5206\u6790\u539f\u7406\u56fe\uff0c\u8d85\u7ed3 MOSFET \u4e0e\u5e73\u9762MOSFET\u7684\u7ed3\u6784\u548c\u53c2\u6570\u533a\u522b\uff0c\u7535\u78c1\u5e72\u6270\u4ea7\u751f\u7684\u539f\u56e0\uff0c\u8bbe\u8ba1\u8005\u53ef\u4ee5\u6839\u636e\u60c5\u51b5\u9009\u62e9\u4f7f\u7528\u548c\u4f18\u5316\u3002<\/p>\n 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\u4e00\u3001\u51cf\u5c0f\u7535\u538b\u548c\u7535\u6d41\u53d8\u5316\u7387<\/p>\n \u51cf\u5c0f\u7535\u538b\u548c\u7535\u6d41\u53d8\u5316\u7387\uff0c\u53ef\u4ee5\u901a\u8fc7\u6539\u53d8\u6805\u6781\u9a71\u52a8<\/u>\u7535\u963b\u3001\u6539\u53d8\u53d8\u538b\u5668\u7ed3\u6784\u6216\u8005\u589e\u52a0\u7f13\u51b2\u5438\u6536\u7535\u8def\u5b9e\u73b0\u3002<\/p>\n (1)\u6539\u53d8\u6805\u6781\u7535\u963b\u503c\u53ef\u4ee5\u6539\u53d8\u5f00\u5173\u7ba1\u7684\u5f00\u5173\u901f\u7387\uff0c\u6539\u53d8\u7535\u538b\u548c\u7535\u6d41\u7684\u53d8\u5316\u7387\uff0c\u5982\u56fe17\u6240\u793a\uff0c\u5728\u5f00\u5173\u7ba1\u7684\u6805\u6781\u5916\u52a0\u9a71\u52a8\u7535\u963bRg=Rg1+Rg2,\u589e\u52a0Rg,\u964d\u4f4e\u5f00\u5173\u7ba1\u7684\u5f00\u901a\u901f\u5ea6\uff0c\u52a0\u5feb\u5f00\u5173\u7ba1\u7684\u5173\u65ad\u901f\u5ea6\u3002\u4e3a\u4e86\u5f00\u5173\u7ba1\u7684\u5f00\u901a\u548c\u5173\u65ad\u901f\u5ea6\u90fd\u964d\u4f4e\uff0c\u53ef\u4ee5\u5982\u56fe17\u6240\u793a\uff0c\u7ed9Rg2\u5e76\u8054\u4e00\u4e2a\u4f4e\u538b\u964d\u5feb\u901f\u6062\u590d\u4e8c\u7ea7\u7ba1\uff0c\u5982\u63a5\u6210D1(\u5b9e\u7ebf)\u7684\u65b9\u5411\uff0c\u5f00\u5173\u7ba1\u5f00\u901a\u65f6\u6805\u6781\u9a71\u52a8\u7535\u963b\u4e3aRg\uff0c\u5173\u65ad\u65f6\u6805\u6781\u9a71\u52a8\u7535\u963b\u4e3aRg1\uff0c\u5f00\u5173\u7ba1\u5173\u65ad\u65f6\u7684\u901f\u5ea6\u76f8\u5bf9\u4e0d\u5e76\u4e8c\u6781\u7ba1\u65f6\u8981\u6162\u3002<\/p>\n \u56fe17 \u6539\u53d8\u6805\u6781\u9a71\u52a8\u7535\u963b<\/p>\n (2)\u5728\u53cd\u6fc0\u53d8\u6362\u5668\u7684\u5f00\u5173\u7ba1\u5173\u65ad\u77ac\u95f4\uff0c\u7531\u4e8e\u53d8\u538b\u5668\u7684\u521d\u7ea7\u6f0f\u611fLk\u548c\u5f00\u5173\u7ba1\u7684\u5bc4\u751f\u8f93\u51fa\u7535\u5bb9Coss\u6784\u6210\u4e86\u4e00\u4e2a\u4e32\u8054\u8c10\u632f\u7535\u8def\uff0c\u4f1a\u4ea7\u751f\u975e\u5e38\u9ad8\u7684\u8fc7\u538b\u548c\u632f\u94c3\uff0c\u7535\u8def\u7684Q\u503c\u8d8a\u9ad8\uff0c\u632f\u94c3\u7535\u538b\u5c31\u8d8a\u9ad8\u3002\u8fd9\u79cd\u8fc7\u9ad8\u7684\u632f\u94c3\u7535\u538b\u53ef\u80fd\u4f1a\u9020\u6210\u5de8\u5927\u7684\u7535\u78c1\u5e72\u6270\uff0c\u5e76\u4e14\u7531\u4e8eMOSFET\u6f0f\u7535\u538b\u7684\u5347\u9ad8\uff0c\u751a\u81f3\u4f1a\u964d\u4f4e\u5f00\u5173\u7ba1\u7684\u53ef\u9760\u6027\u3002<\/p>\n \u6539\u53d8\u53d8\u538b\u5668\u7684\u7ed3\u6784\uff0c\u7ed9\u53d8\u538b\u5668\u7684\u521d\u7ea7\u7ed5\u7ec4\u589e\u52a0\u4e00\u4e2a\u6062\u590d\u7ed5\u7ec4NR=Np\uff0c\u4f7f\u4e24\u4e2a\u7ed5\u7ec4\u6210\u4e3a\u53cc\u80a1\uff0c\u5e76\u6392\u7f20\u7ed5\u5728\u78c1\u82af\u6216\u7ebf\u8f74\u4e0a\uff0c\u5f62\u6210\u53cc\u80a1\u7ed5\u7ec4\u3002\u5982\u56fe18\u6240\u793a\uff0cNR\u4e00\u7aef\u4e0e\u521d\u7ea7\u5730\u76f8\u8fde\uff0c\u4e0eNp\u540c\u540d\u7684\u4e00\u7aef\u901a\u8fc7\u4e00\u4e2a\u4e8c\u6781\u7ba1D1\u8fde\u63a5\u5230Vin\u3002\u8fd9\u79cd\u65b9\u6cd5\u4f7f\u8026\u5408\u6700\u5927\u5316\uff0c\u5e76\u83b7\u5f97\u4e86\u5bc4\u751f\u7535\u5bb9\u4e0e\u7535\u611f\u7684\u4e25\u683c\u5339\u914d\uff0c\u521d\u7ea7\u7ed5\u7ec4\u4e0e\u5176\u5b83\u7ed5\u7ec4\u4e4b\u95f4\u7684\u8026\u5408\u5e76\u6ca1\u6709\u90a3\u4e48\u91cd\u8981\u3002<\/p>\n \u56fe18 \u589e\u52a0\u6062\u590d\u7ed5\u7ec4NR\u548c\u4e8c\u6781\u7ba1D1\u5b9e\u73b0\u65e0\u6e90\u963b\u5c3c\u5668<\/p>\n \u5982\u56fe19\u6240\u793a\uff0c\u56fe(a)\u663e\u793a\u4e86\u5f00\u5173\u7ba1\u5173\u65ad\u65f6\uff0c\u521d\u7ea7\u7535\u6d41(\u901a\u90532\uff0c\u7ea2\u8272\u6ce2\u5f62)\u4e3aCoss\u5145\u7535\u540e\uff0c\u5728MOSFET\u7684\u6f0f\u6781(Vds\uff0c\u901a\u90531\uff0c\u84dd\u8272\u6ce2\u5f62)\u6709\u632f\u94c3\u3002\u56fe(b)\u4e2d\uff0c\u901a\u90531\u4ecd\u4e3aVds\uff0cCoss\u7684\u5145\u7535\u4f7f\u901a\u8fc7D\u7684\u6b21\u7ea7\u7535\u6d41(\u901a\u90532)\u5ef6\u8fdf\u4e86\u7ea6100ns\u3002\u56fe(c)\u4e2d\uff0c\u6062\u590d\u7ed5\u7ec4NR\u76f4\u63a5\u7ed5\u8fc7\u5bc4\u751f\u7535\u5bb9Coss\uff0c\u5c06\u79ef\u7d2f\u7684\u6cc4\u6f0f\u80fd\u91cf\u5bfc\u56de\u7535\u6e90\u8f68\uff0c\u5e76\u7b9d\u4f4d\u5f00\u5173\u7535\u538b(\u901a\u90531)\uff0c\u7531\u4e8eNp=NR\uff0c\u6240\u4ee5\u5c06Vds\u9650\u5236\u5728Vin\u7684\u4e24\u500d\uff0c\u800c\u521d\u7ea7\u7535\u6d41\u7684\u8d1f\u6d6a\u6d8c(\u901a\u90532)\u4e8b\u5b9e\u4e0a\u662f\u4ece\u6062\u590d\u7ed5\u7ec4\u6d41\u51fa\u7684\u7535\u6d41\u3002\u56fe(d)\u4e2d\uff0c\u6b21\u7ea7\u4e8c\u6781\u7ba1D\u9a6c\u4e0a\u53d8\u4e3a\u6b63\u504f\uff0c\u6cc4\u6f0f\u78c1\u901a\u963b\u6b62\u4e86\u7535\u6d41\u7684\u4f20\u8f93\uff0c\u6b21\u7ea7\u7535\u6d41(\u901a\u90532)\u8fbe\u5230\u4e00\u4e2a\u5747\u8861\u7684\u5cf0\u503c\uff0c\u76f4\u5230\u6f0f\u6cc4\u80fd\u91cf\u88ab\u5b8c\u5168\u6062\u590d\uff0c\u521d\u7ea7\u7535\u6d41\u964d\u4e3a\u96f6\u3002<\/p>\n 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C5\u53ef\u4ee5\u964d\u4f4e\u76f8\u5e94\u7684\u529f\u7387\u5668\u4ef6\u4e24\u7aef\u7684\u9ad8\u9891\u7535\u538b\u53d8\u5316\u7387\u3002\u7279\u522b\u6ce8\u610f\u7684\u662f\uff0c\u6240\u6709\u7684\u8fd9\u4e9b\u7f13\u51b2\u5438\u5f15\u7535\u8def\u90fd\u9700\u8981\u6d88\u8017\u4e00\u5b9a\u529f\u7387\uff0c\u4ea7\u751f\u9644\u52a0\u7684\u529f\u7387\u635f\u8017\uff0c\u964d\u4f4e\u7cfb\u7edf\u7684\u6548\u7387;\u540c\u65f6\u4e5f\u589e\u52a0\u5143\u4ef6\u6570\u91cf\u3001PCB\u5c3a\u5bf8\u548c\u7cfb\u7edf\u6210\u672c\uff0c\u56e0\u6b64\u5fc5\u987b\u6839\u636e\u5b9e\u9645\u9700\u8981\u9009\u62e9\u4f7f\u7528\u3002<\/p>\n \u56fe20 \u589e\u52a0\u7f13\u51b2\u5438\u6536\u7535\u8def<\/p>\n \u4e8c\u3001\u51cf\u5c0f\u5bc4\u751f\u7684\u7535\u611f\u548c\u7535\u5bb9\u503c<\/p>\n 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