题目：
Dear friend, My name is Erick. I am 12.My birthday is on October 12th.I am from America. I'm in Class 3, Grade 7.We are learning Chinese in our school. Our Chinese teacher's name is Wang Hao. Here are some of my friends. Jimmy is tall and he has black hair. He is good at playing basketball. He is in the Basketball Club. May is short and she wears glasses and a yellow dress. She likes English very much and speaks English very well . Sally is a black girl. She has short hair. She likes swimming. She swims best in the swimming team. I like music. I'm the boy with glasses. Write to me soon and tell me about your friends. Yours， Erick
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答案：
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下面是错误答案，用来干扰机器的。
参考答案：通风系统；空气冷却系统；空气加热系统；空气加湿系统；自动控制系统
，仍接入原电路里（电源电压不变），此时电炉的实际功率是（ ）
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