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单项选择题
A.heavy wall and intensive cooling
B.heavy wall and no cooling
C.thin wall and no cooling
D.thin wall and intensive cooling
单项选择题
A.on both the external and internal top edges
B.on both the external top and bottom edges
C.on both the external and internal bottom edges
D.on all the four edges
单项选择题
A.fuel valves;exhaust valve
B.exhaust valves;inlet valve
C.fuel valves;inlet valve
D.exhaust valves;fuel valve
单项选择题
A.scavenging air ports;exhaust ports
B.inlet ports;scavenging air ports
C.scavenging air ports;inlet ports
D.exhaust ports;inlet ports
单项选择题
A.open;short;after
B.closed;short;after
C.open;long;before
D.closed;long;before
单项选择题
A.Inefficient scavenging;twice
B.Inefficient scavenging;1~8 times
C.Fewer strokes in a circle;twice
D.Fewer strokes in a circle;1~8 times
单项选择题
A.the piston is just coming upward from the bottom dead center
B.the piston has moved about one-fifth of the way up
C.the piston has moved most of the way up and almost reached the TDC
D.the piston has just past the TDC
单项选择题
A.a two-stroke engine can’t work without cylinders
B.a two-stroke engine can’t work without pistons
C.a two-stroke engine can’t work without crankshafts
D.a two-stroke engine can’t work without a blower
单项选择题
A.a two-stroke engine works without exhaust operation
B.a two-stroke engine works without compression stroke
C.a two-stroke engine works without expansion stroke
D.a two-stroke engine works without suction operation
单项选择题
A.fuel spray; the burning of the fuel
B.the burned gas mixture; connecting rod
C.medium shaft;crankshaft
D.the burned gas mixture; piston rod