A.the inlet port is opened by the up coming piston； the port is closed by the down going
B.the inlet valve is opened by the down going piston；the inlet valve is closed
C.the inlet port is opened by the down going piston；the port is closed by the up coming
D.the inlet valve is opened
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A.inevitable
B.harmful
C.helpful
D.unacceptable
A.increase in temperature
B.lose its energy partly
C.expand and do work
D.begin to be compressed
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