题目1单选题
设<img src="https://tihai-oss-cloud.itihey.com/img/00301daddfc37c502618a7325f005075.gif">在<img src="https://tihai-oss-cloud.itihey.com/img/43c8dcede48330583804721d133e64ae.gif">处可导,则<img src="https://tihai-oss-cloud.itihey.com/img/996a3d1ba7eca60291b27e1af01a1135.gif">_( )_A. <img src="https://tihai-oss-cloud.itihey.com/img/8013f2201c752fe0cf69db6ae6b93cfc.gif">B. <img src="https://tihai-oss-cloud.itihey.com/img/67418f37696ecdc518ea3bb7253feb23.gif">C. <img src="https://tihai-oss-cloud.itihey.com/img/2e21a64432aeb60024445a76076de8f3.gif">D. <img src="https://tihai-oss-cloud.itihey.com/img/e47846b4f40b2e232fddcae6ef70b0ee.gif">