A.开关两端的电压为零
B.电灯两端的电压为零
C.电源两端的电压为零
D.以上说法都不正确
答案:B
What surprised me a lot was that he didn’t know _________the difference between“say
and “speak”lay.
A.what
B.that
C.where
D.which
站内无空闲线路的特殊情况下,只准接入哪些列车?