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问题
选择题
在Rt△ABC中,∠C=90°,下列式子中最大的一个是( )
A.tanA+cotA
B.sinA+cosA
C.tanA+cosA
D.cotA+sinA
答案
答案:
A
选择题
The two friends ____ on the Internet for three hours, and they would go on till the next morning.
A. had been chatting
B. had chatted
C. were chatting
D. have been chatting
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单项选择题
戴接触镜后,角膜基质皱褶的诱因()。
A、水肿液移行至角膜面
B、泪液则处于低渗状态
C、角膜胶原纤维扭曲、反光增强
D、细胞体积变大,重新排列
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