Danny is talking to the man beside ____________. [ ]
A. him
B. he
C. they
答案:A
I’ll give you y friend’s home address ______ I can be reached most evenings.
A.which
B.when
C.whom
D.where
比选器对信号进行优选,主要依据的参数是信噪比和()。
A、噪声电平
B、信号电平
C、音量大小
D、距离