A.keyway
B.shaft
C.packing
D.valve
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A.turbine
B.centrifugal
C.ejector
D.mixed flow
A.has learnt
B.have learnt
C.learn
D.are learning
A.closed discharge valve
B.broken pipe line
C.worn shaft
D.both A and B
A.keyway
B.shaft
C.valve
D.casing
A.self priming
B.positive displacement
C.reciprocating
D.impeller
最新試題
The cetane rating of diesel fuel is an indication of the （）
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One of the reasons that cause oil flowed from sludge outlet of a self-cleaning separator is（）
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Refrigerant entering the compressor of a refrigeration system should be in which of the following conditions?（）
The main purpose of port State control is not to（）
The shipboard oil pollution emergency plan will be invalid after （）
For a given exhaust gas boiler, what is the quantity of its evaporation mainly determined?（）
The Port State Control officer may witness a fire drill carried out by the crew assigned to these duties on the（）