[单选题]当十字头式柴油机缸径>700mm时,在未装活塞环的条件下,活塞位于近上、下止点位置时,活塞裙部减磨环处与气缸内孔单边最小间隙应不小于()。
正确答案 :B
该处总间隙的20%
[单选题]The cylinder and piston must be warmed up () to a temperature of about 140 degF in standing by engine.
正确答案 :C
gradually
[单选题]The purpose of the delivery check valve used in a diesel fuel injection jerk pump is to ().
正确答案 :A
assist in a quick cutoff of fuel injection
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