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问题 填空题

禁止由地面上中性点（）的变压器或发电机向井下供电；

答案

参考答案：接地

填空题

3.15小时=______小时______分钟．
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补全对话，情景问答
从方框中选择最佳选项完成对话。
A. There are eighteen boys in our class.
B. Is there a computer on your desk?
C. Are there twenty boys in your class?
D. How many students are there in your class?
E. Are there any libraries in your school?
Jane: Hello, Daming. __1__
Daming: Hello, Jane. There are forty students in our class.
Jane: __2__
Daming: No, there aren't. __3__
Jane: __4__
Daming: Yes, there are.
Jane: __5__
Daming: No, there isn't. But there is one on our teacher's desk.
Jane: Thank you.
Daming: You're welcome.
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