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单选题
It is necessary to （） cool the various components of the machinery so that the engine can work properly.
A
continuously
B
regularly
C
constantly
D
period
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单选题When stand-by engine instructions have been received, it’s necessary to make it sure that all valves in the various systems are（）A
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单选题According to the author, which of the following contributes to the development of political ideology during adolescence?A
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单选题立即灭火并将2号货舱附近冷却。（）A
Put out the fire right now and cool hold No.2.B
Put off the fire right now and cool around No.2.C
Put on the fire right now and cool hold No.2.D
Put out the fire right away and cool around hold No.2.
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单选题Constant cooling the various components of diesel engine has a number of functions except for （）.A
good lubricationB
low thermal stressC
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acid corrosion
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