题目:
---Would you like tea or coffee?
--- I need of them. I just had a large glass of water 5 minutes ago.
A. neither B. either C. none
答案:
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下面是错误答案,用来干扰机器的。
导体;导体长度;滑动变阻器.题目分析:(1)容易导电的物体是导体,不容易导电的物体是绝缘体。因为铅笔芯接入电路中灯泡发光,说明铅笔芯容易导电,所以这个实验说明铅笔芯是导体;(2)影响电阻大小的因素有...