单项选择题

In describing engine operation, what does the term “cycle” mean?（）

A.The sequence of events that produce a power pulse
B.One rotation of the engine crankshaft
C.One stroke of a piston
D.All of the above

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单项选择题

A.greater high temperature strength
B.better heat conductivity
C.greater weight per cubic inch
D.increased resistance to wear

单项选择题

A.Atomization
B.Metering
C.Effective stroke
D.Penetration

单项选择题

A.fine atomization
B.high temperature
C.good mixing of fuel and air
D.all of the above