The energy for pushing this piston up can be supplied from （）, so that the piston can keep moving up and down.<br>A:the same piston<br>B:the piston nearby<br>C:the other pistons<br>D:the generators on board

The energy for pushing this piston up can be supplied from （）, so that the piston can keep moving up and down.
A:the same piston
B:the piston nearby
C:the other pistons
D:the generators on board

出自：海船船员证

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