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在电动机的继电一接触器控制电路中，热继电器的正确连接方法应当是( )。 (a)热继电器的发热元件串接在主电路中，而把它的动合触点与接触器线圈串接在控制电路中 (b)热继电器的发热元件串接在主电路中，而把它的动断触点与接触器线圈串接在控制电路中 (c)热继电器的发热元件并接在主电路中，而把它的动断触点与接触器线圈并接在控制电路中
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