It just isn’t fair I was working as a waiter last month, my friends were lying on the beach.. A whenever B though C for D while
第1题:
A、were/were
B、was/is
C、were/was
D、was/were
第2题:
若 E[X(t1)] =mx(t1),E[ Y(t2)] =my(t2),E[X(t1) Y(t)2] =mx(t1)my(t2),则随机过程X(t)与Y(t)。
A.不相关
B.相关
C.正交
D.独立
第3题:
____ I?know,?there?isn’t?such?a?word?in?English.
A、As much as
B、So far as
C、As long as
D、As soon as
第4题:
A、haven’t
B、hasn’t
C、isn’t
D、aren’t
第5题:
There must be something wrong with my computer,()there?
A. mustn't
B. needn't
C. isn't
第6题:
– Nice weather, isn't it? – ( ).
A. I'm not sure
B. You know it well
C. Yes, it is
D. Yes, it isn't