單項選擇題The oil is drawn from a drain tank through (), one of a pair of pumps, into one of fine filters.

A.a strain tank
B.a head tank
C.a service tank
D.a strainer


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4.單項選擇題The most common cause of lowering the crankcase lube oil flash point is ().

A.more water contents
B.contamination with fuel oil
C.higher temperature
D.sufficient cooling of oil mist

5.單項選擇題The mechanical efficiency of an engine () because losses occur in the form of friction.

A.is always less than 100%
B.is always more than 100%
C.is always equal to 90%
D.is always less than 90%