问题
多项选择题
在大接地电流系统中，当系统中各元件的正、负序阻抗相等时，则线路发生两相短路时，下列正确的是：
A、非故障相中没有故障分量电流，保持原有负荷电流。
B、非故障相中除负荷电流外，还有故障分量电流
C、非故障相电压要升高或降低，升高或降低随故障点离电源距离而变化
D、非故障相电压保持不变
答案
参考答案：A,D
解析：
知识点：基础知识
搜题请搜索小程序“爱下问搜题”
在大接地电流系统中，当系统中各元件的正、负序阻抗相等时，则线路发生两相短路时，下列正确的是：
A、非故障相中没有故障分量电流，保持原有负荷电流。
B、非故障相中除负荷电流外，还有故障分量电流
C、非故障相电压要升高或降低，升高或降低随故障点离电源距离而变化
D、非故障相电压保持不变
参考答案：A,D
解析：
知识点：基础知识
阅读下面的一封信，按要求完成各项任务。 （每小题1分，满分5分） I’ve got some information for everyone going to Britain next month. As you know, you’ll be staying with a family for two weeks. Now the most important thing is money. You should take about ￡30 in cash(现金) and about ￡200 in traveler cheques(支票). Then when you arrive at the airport you’ll be met by our host(主人) family. You must remember to wear a red shirt so  the family will find you easily. I’ve told them to look out for the red shirts. You’ll also need to take with you 4 photos of yourself and, of course, it’s very important that you take the school letter. While you are there, if you have any problems, you can call our agent(代理人). I’ll give you her office phone number now: It’s 580-4436 and the person to ask for is Mrs. Belcher, that’s B-E-L-C-H-E-R. She’s in the office from 9-5 every day. OK! That’s everything. Have a good trip.根据短文内容填写下表，每空词数不限：
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