單項(xiàng)選擇題Energy loses ()friction occurs in every engine.

A.because
B.thanks to
C.dues to
D.owing to


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3.單項(xiàng)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

4.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

5.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