单项选择题

Internal combustion engine crankcase vent outlets must be equipped with （）

A.hinged rain guards
B.corrosion resistant flame screens
C.dipsticks for measuring oil levels
D.crankcase ventilation fans

相关考题

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Proper lubrication of the main bearing is more easily o...

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B.bearing pressure in a two-stroke\cycle single acting diesel engine is continually reversed
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船舶电气与船舶安全

Internal combustion engine crankcase vent outlets must be equipped with （）