The method to prove electric capacity of coaxial hollow inside cylinder with the electric image law is introduced in this text.

本文介绍了用电象法求非同轴空心圆柱电容的方法。

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The piston is a cylindrical shaped hollow part that moves up and down inside the engine cylinder.

活塞是一个中空的圆柱体形状部件，其在发动机气缸里做上下往复运动。

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