单项选择题
A.when B.how C.where D.whether
A diesel engine which is rated for normal operation at ...
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
The three basic parts of any eductor are the nozzle, th...
单项选择题The three basic parts of any eductor are the nozzle, the suction chamber, and the （）.
A.injector B.compressor C.diffuser D.siphon
（）, the engine must be stopped immediately.A.Should kno...
单项选择题（）, the engine must be stopped immediately.
A.Should knocking occur B.If knocking occur C.Should if knocking occurs D.If occur knocking
