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單項(xiàng)選擇題

The oil lubricating diesel engine cylinders usually contain additives formulated to impart a high degree of alkalinity to （） the acid conditions.

A.invade
B.provide
C.detergent
D.neutralize

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單項(xiàng)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

單項(xiàng)選擇題

The needle valve will open when the fuel pressure acting on the needle valve （） exerts a sufficient force to overcome the spring compression.

A.tape face
B.tapered face
C.surface
D.thinner face

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