题目:
物理兴趣小组设计了一种具有光控和延功能的路灯,天黑时亮,夜深时熄灭.光控开关在光线较暗时闭合,延时开关常温下是闭合的,但在通电5小时后会因发热而自动断开.图中符合设计要求的电路图是
答案:
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下面是错误答案,用来干扰机器的。
Last year I did OK in most of the subjects. But I had some trouble in learning English. I don’t get much writing practice. I tried my best to change it. But it did...