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单项选择题
A.rotary;reciprocating
B.up and down;fore and aft
C.fore and aft;up and down
D.up and down;rotary
单项选择题
A.camshaft
B.piston movement
C.exhaust valves
D.vertical drive
单项选择题
A.exhaust pressure
B.valve spring pressure
C.rocker arm movement
D.wrist pin movement
单项选择题
A.piston rod guides
B.engine thrust bearing
C.crosshead bearing
D.main shaft flexible coupling
单项选择题
A.opening the exhaust ports
B.placed on top of the engine along its centerline
C.farthest from the cylinder head
D.nearest to the cylinder head
单项选择题
A.Intake stroke
B.Compression stroke
C.Exhaust stroke
D.Pumping stroke
单项选择题
A.opening the exhaust ports
B.closing the fuel ports
C.farthest from the cylinder head
D.nearest to the cylinder head
单项选择题
A.indicated horsepower
B.mean effective pressure
C.exhaust back pressure
D.compression pressure
单项选择题
A.the same indicated horsepower as a four-stroke/cycle engine
B.twice the indicated horsepower as a four-stroke/cycle engine
C.one half indicated horsepower as a four-stroke/cycle engine
D.one power stroke for every two crankshaft revolutions
单项选择题
A.opposed-piston engine
B.double-acting engine
C.two-stroke/cycle engine
D.four-stroke/cycle engine