A.valve loop
B.valve uniflow
C.valve overlap
D.valve grinding
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A.the inlet valve is open
B.the exhaust valve is open
C.both valves are close
D.both valves are open
A.less than
B.greater than
C.equal to
D.twice larger than
A.less than
B.greater than
C.equal to
D.twice larger than
A.a working cycle
B.the operation
C.two fuel injections
D.events
A.turning cycle
B.working cycle
C.working hour
D.working stroke
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