A.drained off
B.collected
C.sent to the crankcases
D.separated with oil
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B.reciprocating compressors
C.centrifugal compressors
D.screw compressors
A.starting diesel engines
B.pneumatic control systems
C.pneumatic tools
D.supercharging air
A.globe valves
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C.gate valves
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C.the liquor
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A.in boiler drums
B.in refrigerating plants
C.in starting air pipes
D.in air coolers
最新試題
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Using a file without a handle may result in （）
If separating effect is not good, which measure should be taken （）
（） is not installed on the main switchboar.
The shipboard oil pollution emergency plan will be invalid after （）
Flame failure in an automatically fired auxiliary boiler can from a/an （）
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