WTZK type temp, controller is an electrical switch that can make circuit close or open following change of controlled medium temp.

WTZK型温度控制器是可随被控介质温度变化而使电路闭合或断开的电开关。

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The switches close the contacts and complete the circuit.

这些开关可接通形成闭合电路。

《牛津词典》

This makes a close circuit.

这构成一个闭合电路。

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