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单选题
During （）, the starting air valves should be closed to prevent the engine from turning.
A
overhaul
B
running
C
blowing down
D
All of the above are correct
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They should always be started with the discharge valve openedC
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单选题During fueling, all doors. Hatches,and ports（）.A
to windward should be opened and the ones to leeward should be closedB
to leeward should be opened and the ones to windward should be closedC
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