【单选题】【消耗次数：1】
欲使接触器KM1和接触器KM2实现互锁控制，需要（）。
①
在KM1的线圈回路中串入KM2的常开触点
②
在KM1的线圈回路中串入KM2的常闭触点
③
在两接触器的线圈回路中互相串入对方的常开触点
④
在两接触器的线圈回路中互相串入对方的常闭触点
参考答案：
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相关题目
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欲使接触器KM1动作后接触器KM2才能动作，需要（）。
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在KM1的线圈回路中串入KM2的常开触点
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