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【单选题】
燃气涡轮发动机中控制涡轮间隙时,采用的方法( )A.
都是主动控制
B.
都是被动控制
C.
是控制涡轮机匣的膨胀量
D.
是控制涡轮叶片的膨胀量
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反馈参考答案：
举一反三
【单选题】According to the INCOTERMS 2010, the insurance required under a CIF contract has to cover _________.
A.
the minimum conditions.
B.
the maximum conditions.
C.
moderate conditions.
D.
any conditions at the seller's option.
【单选题】According to the INCOTERMS 2010, the insurance required under a CIF contract has to cover_______.
A.
the minimum conditions
B.
The maximum conditions
C.
moderate conditions
D.
Any conditions at seller’s option
【单选题】According to the INCOTERMS 2010, the insurance required under a CIF contract usually has to cover .
A.
the minimum conditions.
B.
the maximum conditions.
C.
moderate conditions.
D.
any conditions at the seller's option.
【简答题】减压蒸馏开始时,要先减压再加热,顺序可否颠倒,为什么 ? 减压蒸馏由哪几部分组成?
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