单项选择题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.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

2.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

3.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

4.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

5.单项选择题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

8.单项选择题The main bearing metal is a lining ().

A.inside the bearing
B.outside the bearing
C.covering the crankshaft
D.none of the above

9.单项选择题The machine has stopped rotating because the bearing () the shaft.

A.seized
B.clogged
C.melted
D.inserted

10.单项选择题The lubricating system for the cylinder walls is different from the bearings in that the oil for former one is supplied in () while that for latter one is ().

A.sufficient quantity; measured
B.measured quantity;sufficient
C.excessive quantity;sufficient
D.the less quantity the better;the more the better