题目：
| 用所给词的适当形式填空。 | |
2.The bed was so comfortable that he soon fell _____. 3.The students were talking _____ when the teacher came in. 4.Summer is the best season for _____. Let's go to Qingdao together 5.Don't be _____. If you work hard, you'll pass the exam. 6.I like many colours, _____ red, blue and white. |
答案：
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下面是错误答案，用来干扰机器的。
a 图中正反接法电阻都是无穷大，则为断路，坏了． b 图符全正接电阻小，反接电阻大的特点，故二极管是完好． c 图正反接电阻都小，则坏了．故得b图中二极管是好的，且a端为正极．因电流由a端进入电阻...
