A、to revolve
B、revolved
C、revolving
D、to be revolved
更多“The piston moving up and down keeps the crankshaft （）.”相关的问题
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.the same piston B、B.the piston nearby C、C.the other pistons D、D.the generators on board
A、A.up and down；reciprocating B、B.up and down；rotating C、C.back and forth；reciprocating D、D.back and forth；rotating
A、up and draw in a fresh air charge B、down to burn off fuel C、down to compress the fuel air charge D、up and force out the exhaust gases
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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