电子式电能表的关键部分是()。
A、工作电源
B、显示器
C、电能测量单元
D、单片机
参考答案:C
________you want to improve your oral English, you should start speaking English every day. [ ]
A. So long as
B. In order that
C. Even though
D. Now that
E-mail地址由用户名和域名两部分组成,这两部分的分隔符为______。