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【单选题】
Remind him ______ the window and door when he leaves.A.
of closing
B.
closing
C.
to close
D.
close
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反馈参考答案：
举一反三
【单选题】To reduce the weight of the reciprocating parts, pistons of high-speed engines are made considerably shorterThis results in __________.
A.
less piston slap and quieter running
B.
increased crankshaft bearing wear
C.
slightly greater piston wear
D.
decreased side pressures
【简答题】Due to this limit, what happen to the early German gas turbine engines?
【单选题】The early engines could____________(产生) one or two horsepower.
A.
product
B.
produce
C.
productive
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