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【单选题】
发动机的推进效率是 CA.
单位时间发动机产生的机械能与单位时间内发动机燃油完全燃烧时放出的热量之比
B.
发动机的推力与动能之比
C.
发动机推进功率与单位时间流过发动机空气的动能增量之比
D.
推进功率与单位时间内发动机加热量之比
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举一反三
【简答题】Which company does he work in at present? ________________.
【简答题】Which company does he want to work with?
【简答题】Which company does David Stevenson work for?
【简答题】Which department does Simon Winters work in?
【简答题】曲线y=x 3 -4x在点（1，-3）处的切线斜率为______．
【单选题】No one in the company could match John's hard work and ______ to work, which is why the general manager liked him.
A.
committee
B.
committed
C.
commitment
D.
commission
【简答题】曲线y=x 3 -1在点(1，0)处的切线斜率为______．
【简答题】In which of the following ways does the handgrip work?
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