单项选择题
A centrifugal pump can’t supply water after startingYou should check （）.
A.priming water
B.power supply
C.packing gland
D.bearing lubrication
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Open the （）of inter cooler before starting an air compressor.
A.cylinder cover
B.cooling water
C.oil cup
D.drain valve -
单项选择题
Open the （）before starting an air compressor.
A.unload valve
B.cooling water
C.oil cup
D.sump -
单项选择题
Supply the （）before starting an air compressor.
A.fuel oil
B.cooling water
C.steam
D.power
