【单选题】The carburetor is placed on the engine to ______.
A.
distribute the gasoline
C.
properly lubricate the engine
D.
assist in priming the cylinders
【单选题】Students often ______ a lot of difficulties when they communicate with foreigners for the first time.
【简答题】活塞顶部的形状与混合气形成方式,燃烧室设计和发动机压缩比大小有关,下面4个选项中的活塞实物图,哪些是典型的汽油机活塞?A. B. C. D.
【单选题】Fuel is admitted to a diesel engine cylinder through the _____.