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单选题
The crankcase of many diesel engines are kept under a slight vacuum by the （）.
A
scavenging action of the piston
B
piston type vacuum pump taking suction off a differential manometer
C
gland exhausting manometer
D
crankcase exhaust fan
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increase the air charge velocityC
reduce the risk of explosionD
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考题
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考题
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考题
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考题
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to inspect the steering gear spaces at suitable intervalsD
to inspect and overhaul the equipments in his charge
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