单项选择题
The primary function of a fuel delivery check valve assembly is to（）
A.deliver proper fuel quantity to the injection nozzle
B.provide rapid fuel injection cutoff
C.control fuel quantity entering the pump body
D.control fuel pressure delivered to the combustion chamber
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相关考题
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单项选择题
For any piston ring to operate smoothly without scuffing ,the ring must be （）.
A.of a material harder than the cylinder liner
B.properly lubricated
C.prevented from compressing
D.prevented from rotating during engine operation -
单项选择题
Shaker, circulation and spray are the three general methods used in（）
A.pre-injection fuel oil treatment
B.lube oil filtration
C.lube oil purification
D.piston cooling -
单项选择题
Wristpin bearings are difficult to lubricate because of their oscillating motion and（）
A.their free-floating design
B.their relatively small size
C.the reciprocating motion of the piston
D.their position in the lubrication system
