A、<img width="55" height="38" src="https://static.tiw.cn//s/tiw/p3/UpLoadImage/2013-05-07/9109bcc4-870e-45e1-bb04-9ff2d24b9657.png">
B、<img width="49" height="19" src="https://static.tiw.cn//s/tiw/p3/UpLoadImage/2013-05-07/068cda70-ab90-431c-8642-d9d521b207d8.png">
C、<img width="67" height="17" src="https://static.tiw.cn//s/tiw/p3/UpLoadImage/2013-05-07/cd026e06-7727-49b0-a117-c725b5901f63.png">
D、<img width="98" height="36" src="https://static.tiw.cn//s/tiw/p3/UpLoadImage/2013-05-07/655b6318-f616-4c1a-a17b-d67152767874.png">
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试题解析
等式两边同时微分,得: