Therefore, a connector and a contact surface between the connected guide wires are added through the inner connecting pipe and the outer connecting pipe to lower the resistance of the contact surface.

因此，它可以通过内连接管和外连接管大大增加连接器与被连接导线间的接触面，降低接触面电阻。

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While flowing through a pipe, the fluid is subjected to the loss of head due to the friction of the inner surface of the pipe against it.

流体流经管道时，由于管道表面的摩擦力而产生力头损失。

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While flowing through a pipe, the fluid is subjected to the loss of head due to the friction of the inner surface of the pipe against it.

流体流经管道时，由于管道表面的摩擦力而产生力头损失。

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