单项选择题
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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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 -
单项选择题
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 -
单项选择题
The needle valve in the injector （） at a pre-set pressure which ensures that the fuel will atomize once it enters the cylinder.
A.will lift
B.will be lifted
C.will close
D.will be closed
