單項(xiàng)選擇題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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1.單項(xiàng)選擇題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

2.單項(xiàng)選擇題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

3.單項(xiàng)選擇題The main factor determining the output of each cylinder is the cylinder ().

A.density
B.bore
C.weight
D.material

4.單項(xiàng)選擇題The main bearings are provided with thin-walled (), lined with a copper-lead alloy.

A.steel guides
B.steel shells
C.steel bearing caps
D.pig iron