单项选择题
A.closed B.opened fully C.cracked open D.partly open
A centrifugal pump can’t supply water after startingYou...
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
Open the （）of inter cooler before starting an air compr...
单项选择题Open the （）of inter cooler before starting an air compressor.
A.cylinder cover B.cooling water C.oil cup D.drain valve
Open the （）before starting an air compressor.A.unload v...
单项选择题Open the （）before starting an air compressor.
A.unload valve B.cooling water C.oil cup D.sump
