單項選擇題Energy loses （）friction occurs in every engine.
A.because
B.thanks to
C.dues to
D.owing to
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1.單項選擇題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
2.單項選擇題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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