ZD9转辙机用手扳动自动开闭器动接点,其摆动量不大于()。
A、1mm
B、2mm
C、3.5mm
D、4mm
参考答案:C
—Mr. Lee ______ to a student when I entered the classroom this morning.
—He is very patient ______ he is young. [ ]
A. talking; but
B. talks; though
C. was talking, though
D. talked, however
家父:父亲
A.老媪:老伴
B.鼻祖:祖宗
C.作者:自己
D.鄙人:自己