單項選擇題The majority of medium speed and high speed marine diesel engines for main or auxiliary drive operate on the () cycle.

A.two-stroke
B.four-stoke
C.long-stroke
D.short-stroke


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1.單項選擇題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

2.單項選擇題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

3.單項選擇題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

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

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

5.單項選擇題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