单项选择题
A.prolong the ignition delay period B.ensure the beginning of fuel injection C.thoroughly utilize the air charge D.allow controlled fuel combustion
The primary function of a fuel delivery check valve ass...
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
For any piston ring to operate smoothly without scuffin...
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
Shaker, circulation and spray are the three general met...
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
