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單項選擇題

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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單項選擇題

（）, the engine must be stopped immediately.

A.Should knocking occur
B.If knocking occur
C.Should if knocking occurs
D.If occur knocking

單項選擇題

Grind the （）.

A.keyway
B.shaft
C.packing
D.valve