题目内容

函数的极值可能在不可导点处取得。

A. 对
B. 错

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函数在其极小值点一定不能取得最大值。

A. 对
B. 错

一般情况下,提出舱位预订的申请不应晚于航班离港前( )小时。

A. 2
B. 3
C. 5
D. 8

Such crimes may be so complex that months or years ago by before anyone _______them.

A. discovered
B. will discover
C. would have discovered
D. discovers

I will speak to him as soon as he ______.

A. will come back
B. is coming back
C. comes back
D. come back

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