Pneumatic piston 12 travel can be limited by means of a simple multi-position mechanical stop plunger 16.
可借助于简单的多位置的机械式停止柱塞(16)限制气动活塞(12)的行程。
Even if we put a catch in the cylinder to stop the piston at some point in its rise, we still can't calculate work.
既使我们把一个制动片放进气缸以阻止活塞在某点继续上升，也不能计算功。
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