问题
填空题
如图所示，灯L1与L2串联，先用电压表测灯L1两端的电压，再测L2两端电压时，只将电压表接A点的一端改接C点，这种接法________，理由是________．
答案
不对；电压表的正负接线柱会接反。
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如图所示，灯L1与L2串联，先用电压表测灯L1两端的电压，再测L2两端电压时，只将电压表接A点的一端改接C点，这种接法________，理由是________．
不对；电压表的正负接线柱会接反。
| 完形填空。 We have a two-day holiday __1 _ week. We don't have any lessons __2__ Saturday or Sunday. So every weekend I have a good __3__. On weekend, I like __4_ a trip. I sometimes go to the country with my classmates __5__ bus to breathe (呼吸) the fresh air., watch the green hills and blue water, and __6 _ in the beauty of the country. sometimes I go for a picnic in the open _7__ with my friends by bike, we sing and dance __8 __ there. Sometimes I go to __9__ a place of interest with my parents by car. My weekend is always _ 10__ interesting and happy. | ||||
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