A.fuel valves;exhaust valve
B.exhaust valves;inlet valve
C.fuel valves;inlet valve
D.exhaust valves;fuel valve
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A.scavenging air ports;exhaust ports
B.inlet ports;scavenging air ports
C.scavenging air ports;inlet ports
D.exhaust ports;inlet ports
A.open;short;after
B.closed;short;after
C.open;long;before
D.closed;long;before
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
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
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
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