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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The mechanical efficiency of an engine is always less than 100% （） losses occurring in the form friction.

A.because
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C.due to
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The pressure difference before and after the lube oil filter indicates （）the filter should be cleaned.

A.when
B.how
C.where
D.whether