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單項選擇題

A diesel engine which is rated for normal operation at a crankshaft speed of 800 RPM, is commonly classed as a （）.

A.slow-speed diesel
B.medium-speed diesel
C.high-speed diesel
D.constant-speed diesel

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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

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