单项选择题
Open the （）before starting an air compressor.
A.unload valve
B.cooling water
C.oil cup
D.sump
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相关考题
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单项选择题
Supply the （）before starting an air compressor.
A.fuel oil
B.cooling water
C.steam
D.power -
单项选择题
During working of an air compressor, （） should be drained.
A.oil sump
B.oil separator
C.outlet pipe
D.inlet pipe -
单项选择题
During working of an air compressor, （） should be drained.
A.inter cooler
B.cylinder
C.outlet pipe
D.inlet pipe
