新安装的与运行中的二次回路，保护和安全自动装置、二次回路及其他设备应作交流（）V/1min耐压试验。
参考答案：1000
— May I come in? I'm sorry I am late.
— Come in, please. But could you please tell me _____? [ ]
A. how do you come to school
B. what were you doing then
C. who you talked with
D. why you are late again
问卷的（）主要是表示对被调查者合作的感谢，记录调查人员姓名、调查时间、调查地点等。
A.前言
B.序言
C.结束语
D.引言
