介绍了钳形接地电阻测试仪的测试原理，即在测量时必须要有一个供电流流过的有效的闭合回路。

It describes the measure principle of the clamp grounded resister tester, that is, a effective close loop for current flow is necessary when doing the test.

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根据这个原理，当歌唱者在声门的“冲开”和“闭合”环节上不能与气息相辅相成地协调工作时就会产生破音。

According to singing principle, break will take place when singer cannot coordinate breath during opening and closing of the glottis.

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最后，应用最小势能原理确定位移幅值的闭合解。

Finally, a closed form solution of additional displacements is obtained by the principle of minimum potential energy.

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一些简单的开、闭合电路，可以让孩子们掌握机械系统的工作原理。

Some areas covered include developing an understanding of simple, open, and closed circuits and learning how different mechanical systems work.

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一些简单的开、闭合电路，可以让孩子们掌握机械系统的工作原理。

Some areas covered include developing an understanding of simple, open, and closed circuits and learning how different mechanical systems work.

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