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单选题
（）does it take to change the main engine from ahead to astern?
A
How many times
B
How much water
C
How long
D
How length
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stopping the main engine suddenlyB
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单选题（）does it take to change the main engine from ahead to astern?A
How many timesB
How much waterC
How longD
How length
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单选题Where is the cooling water from the compensating tank in the cooling water system of main engine lead to?（）A
discharge side of the centrifugal pumpB
suction side of the centrifugal pumpC
the lowest point of the cooling water systemD
inlet of the main engine
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