單項(xiàng)選擇題The three basic parts of any eductor are the nozzle, the suction chamber, and the （）.
A.injector
B.compressor
C.diffuser
D.siphon
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1.單項(xiàng)選擇題（）, the engine must be stopped immediately.
A.Should knocking occur
B.If knocking occur
C.Should if knocking occurs
D.If occur knocking
2.單項(xiàng)選擇題Grind the （）.
A.keyway
B.shaft
C.packing
D.valve
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During the diesel engine running, the water level of F.W expansion tank should normally kept in the （） level of glass tube.
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