问题 单项选择题

在正弦交流电中,通常将交流电的()、频率和初相称为正弦量的三要素。

A、最大值

B、幅值

C、最小值

答案

参考答案:B

写作题

书面表达。

       亲爱的同学们,时间过得真快,2009年的寒假 (winter holiday) 仿佛还在眼前,转眼, 2010年的

寒假即将到来,你打算怎样去度过呢?你一定早就勾画好了吧,那就赶快把你的想法说出来,与我们

一起分享吧!

       要求:

       1. 你的文章须包含以下的内容:

         ◆ Where did you go and what did you do last winter holiday?

         ◆ Where are you going this winter holiday?

         ◆ What are you going to do this winter holiday?

         ◆ In the winter holiday, what can you do to help your parents?  

       2. 字数在60词左右

       3. 文章中不要出现真实的姓名和学校。

        How time flies! The winter holiday in 2010 is coming. Last winter holiday, I                                      

                                                                                                                                                          

                                                                                                                                                          

问答题 简答题