单选题Internal combustion engine crankcase vent outlets must be equipped with （）Ahinged rain guardsBcorrosion resistant flame screensCdipsticks for measuring oil levelsDcrankcase ventilation fans
单选题
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
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