单项选择题
The main moving parts of a diesel engine consist of the （） and the pistons.
A.bedplate, connecting rods
B.crankshaft, the connecting rods
C.frames, crossheads
D.crankshaft, the cylinder
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单项选择题
The main function of the lubrication system in to enable （） of a film of oil between the moving parts.
A.the information
B.the formation
C.the scatter
D.the friction -
单项选择题
The main factor which determines the output of each cylinder is （）
A.the cylinder weight
B.the cylinder bore
C.the cylinder length
D.the cylinder cover -
单项选择题
The main factor determining the output of each cylinder is the cylinder （）.
A.density
B.bore
C.weight
D.material
