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【单选题】
往复泵在启动前（ ）液体。A.
一定要充满
B.
无须充满
C.
充以适量的
D.
可充满也可充以适量的
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【简答题】下列应税项目中，不能按次计算征收个人所得税的是（ ）。
【单选题】Up to now, nothing______Betty. I want to know the reason______he hasn' t written to me.
A.
has heard from that
B.
was heard from that
C.
has been heard from why
D.
heard from why
【单选题】He always brings me a pretty gift he comes to visit me. A．by the timeB．every time whenC．every t
A.
He always brings me a pretty gift ____ he comes to visit me. A．by the time
B.
every time when
C.
every time
D.
at times
【简答题】词组英汉互译: (1)系统安全工程 ; (2)危险源控制 ; (3)logical reasoning process ; (4)system’s life cycle ; (5)make decision 。
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