．______ surprised the family most was ___爱下问搜题

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问题选择题

．______ surprised the family most was ________the girl played basketball very well．

A．That; that

B．That; what

C．What; that

D．What; what

答案

答案：C

解答题

函数f(x)对一切实数x,y均有f(x+y)-f(y)=(x+2y+1)x成立，且f(1)=0.

（1）求f(0);

(2)求f(x);

(3)不等式f(x)＞ax-5当0＜x＜2时恒成立，求a的取值范围.

单项选择题 B1型题

安装B2A型生物安全柜（）。

A.需要外接排风管道

B.不需要外接排风管道

C.超净工作台

D.生物安全柜

E.全排生物安全柜