单项选择题
The period of valve overlap is when （）.
A.the inlet valve is open
B.the exhaust valve is open
C.both valves are close
D.both valves are open
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相关考题
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单项选择题
The outside diameter of the pipe is （） the diameter of the bore of the piston rod, the result being that an annular space formed between the piston rod and the pipe.
A.less than
B.greater than
C.equal to
D.twice larger than -
单项选择题
The outside diameter of the pipe is （） the diameter of the bore of the piston rod, the result being that an annular space formed between the piston rod and the pipe.
A.less than
B.greater than
C.equal to
D.twice larger than -
单项选择题
The operation between two fuel injections is called a working cycle, which consists of a fixed sequence of eventsWhat does "which" mean in this sentence?（）
A.a working cycle
B.the operation
C.two fuel injections
D.events
