单项选择题
The expansion tank in a diesel engine closed freshwater cooling system is located at （）
A.the highest point in the system B.the lowest point in the system C.near the floor D.plate level or near the tank top level
单项选择题 On most modern diesel engines, the main and connecting rod bearings receive their lubricating oil by （）.
单项选择题 The main function of tie rods in the construction of large, low speed diesel engines is to（）.
单项选择题 The intake valves in a diesel engine are reseated by （）.
