单项选择题
A.because B.since C.due to D.owing to
The pressure difference before and after the lube oil f...
单项选择题The pressure difference before and after the lube oil filter indicates （）the filter should be cleaned.
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
