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单项选择题
A.excessive pump speed
B.excessive suction head
C.worn wearing rings
D.gross pump misalignment
单项选择题
A.Distillation is the process of boiling seawater to produce vapor which is condensed into fresh water
B.Evaporation is the second part of the distillation process where brine is removed
C.Brine is the result of condensed sea water vapor
D.Distillate is the product resulting from the evaporation of fresh water vapor
单项选择题
A.absolute humidity
B.specific humidity
C.effective humidity
D.relative humidity
单项选择题
A.drain water from the air receiver
B.drain water from the cylinders
C.delay the compression process until the motor is up to speed
D.check pump alignment
单项选择题
A.face shield
B.a respirator
C.rubber gloves
D.an all purpose gas mask
单项选择题
A.lantern rings
B.bearings
C.easing volutes
D.wearing rings
单项选择题
A.packing gland
B.mechanical seals
C.lantern rings
D.wearing rings
单项选择题
A.through a detachable hose connection
B.after passing through an activated charcoal filter
C.after chemical analysis shows it is fit for consumption
D.through a solenoid operated three-way valve
单项选择题
A.worn gland sealing shaft
B.worn wearing rings
C.a bent shaft
D.reversed pump coupling
单项选择题
A.A power end and fluid end
B.A propeller and educator
C.A volute and impeller
D.A turbine and piston
