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问题
单项选择题
急性或亚急性结膜炎的潜伏期（）
A.1～6天
B.2～5天
C.1～3天
D.3～4天
E.1～2周
答案
参考答案：C
选择题
_____ is true friendship is that he or she would like to do all she can _____ his or her friends when they are in trouble.
A. What; help
B. It; to help
C. What; to help
D. Which; help
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判断题
可微函数若是隐式表达，函数变量不必反解出来也能求其导数。
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