单项选择题
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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A.injector
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（）, the engine must be stopped immediately.
A.Should knocking occur
B.If knocking occur
C.Should if knocking occurs
D.If occur knocking -
单项选择题
Grind the （）.
A.keyway
B.shaft
C.packing
D.valve
