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