单项选择题
During compressors running the accumulated moisture in the separators must be （）.
A.drained off
B.collected
C.sent to the crankcases
D.separated with oil
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相关考题
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By far the greatest use is for diesel engine starting using air pressure of 25 bar or more provided by （）.
A.rotary compressors
B.reciprocating compressors
C.centrifugal compressors
D.screw compressors -
单项选择题
Compressed air is used on board ship for all the following purposes except （）.
A.starting diesel engines
B.pneumatic control systems
C.pneumatic tools
D.supercharging air -
单项选择题
Low pressure air is usually taken through （） or pressure regulators to a low pressure reservoir supplying a ring main through driers.
A.globe valves
B.butterfly valves
C.gate valves
D.reducing valves
