单项选择题
Energy loses （）friction occurs in every engine.
A.because
B.thanks to
C.dues to
D.owing to
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单项选择题
The mechanical efficiency of an engine is always less than 100% （） losses occurring in the form friction.
A.because
B.since
C.due to
D.owing to -
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 -
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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
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