Read and chooseMiss White: We'll have an English party next Tuesday!_1.Zhang Peng: _2.Miss White: Wo

题干

Read and choose

Miss White: We'll have an English party next Tuesday!____.

Zhang Peng: ____.

Miss White: Wonderful! ____.

John: ____.

Miss White: Thank you, John.

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C,A,D,B

如图所示是带有水温调节功能的家庭水族箱．该水族箱的鱼缸水温调节器铭牌如表所示．其工作原理如图，R₁为阻值可调的电热丝，开关S₂为单刀双掷开关．开关S₁闭合、S₂接b时，电路处于加热状态；当开关S₁闭合、S₂接a时，电路处于保温状态．（不考虑温度对电阻的影响）试问：