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【单选题】
喷气发动机的总效率与循环热效率及推进效率之间的关系为：（）.A.
总效率等于热效率与推进效率的乘积
B.
总效率等于热效率与推进效率之比
C.
总效率等于推进效率与热效率之比
D.
推进效率等于热效率与总效率的乘积
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【多选题】What is the purpose of the recover command？（）
A.
Recover database datafiles from physical disk backup sets.
B.
Recover required incremental backups from physical disk backup sets.
C.
Recover required archived redo logs from physical disk backup sets.
D.
Apply incremental backups to recover the database.
E.
Apply archived redo logs to recover the database.
【单选题】Heat exchangers
A.
recover up to 90% of heat that would otherwise be lost.
B.
recover over 90% of heat that would otherwise be lost.
C.
are difficult to use.
【简答题】A．offset B．disrupt C．restore D．relieve
【单选题】How can we _____ silent on this question? . A . relieve B . remind C . remain D . recover
A.
relieve
B.
remind
C.
remain
D.
recover
【单选题】I could easily perceive that his heart burnt to relieve his starving kids, but he seemed ashamed to ______ his inability to me.
A.
discover
B.
recover
C.
demonstrate
D.
impress
【简答题】A. recover B. relax C. relieve D. remove
【单选题】Believe it or not, crying is a way you can imagine ______ pressure.
A.
relieving
B.
to relieve
C.
relieved
D.
relieve
【简答题】A．offset B．disrupt C．restore D．relieve
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