操作高压电气设备主回路时，操作人员必须（），并（）或站在绝缘台上。

HONET网管系统应该具备的四大功能是什么？

下列属于合唱中男低音声部的是（）。

A.Bass

B.Tenor

C.Soprano

D.Alto

假如你是高二学生，叫程威，今年有机会到伦敦去学习一年。你想了解英国的一些情况，就给英国笔友Jack发了邮件，请他介绍一下。Jack根据你提的问题，做了答复，主要包括：

1. 学习上：你要来的中学是当地非常有名，通过和老师、同学交流你可很快提高英语水平；

2. 生活上：可以找一家host family，和他们吃住在一起，可以更好地了解英国人生活习惯；

3. 业余时间：游览伦敦名胜，如泰晤士河 (the River Thames)、伦敦眼(the London Eye).等；

4. 不利之处：交通拥挤。

注意：1. 可适当增添内容，使行文连贯；2. 开头和结尾，不计总词数；3. 词数：120左右。

Dear Cheng Wei,

I’m very glad to know that you will get a chance to study in London for a year. I’d like to tell you something about London so that you can have some ideas about it before you come.

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_______________________________________________________________________________Looking forward to your coming.

Yours,

Jack

PROM