题目:
一个能吹冷热风的电吹风的简化电路如图所示。图中A是吹风机,B是电热丝。若闭合开关________,吹出的是冷风;若闭合开关________,吹出的热风。(两空均选填“S1 ”、“S2 ”或“S1 和S2”)
答案:
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Travelling is becoming more and more popular. I visited Hainan Island during this Winter Vacation. It was really a great time. I went to the beach, listened to t...