架空管道每隔( )应接地一次,接地电阻不应超过( )。
A.15~20m,30Ω
B.20~25m,30Ω
C.15~20m,25Ω
D.20~25m,25Ω
参考答案:B
最近学校为每个班级配备了一个图书角,提供了许多适合青少年阅读的书籍。这也极大的激发了学生们的阅读兴趣。为此,老师安排组织了一个有关阅读主题的班会。下面是你们班的外籍同学Robbie的发言稿,请将其补充完整。
Reading is very 小题1: in our life. We can get 小题2:through reading. Reading is also a useful 小题3: to learn a foreign language like English. Textbooks, newspapers, magazines and other kinds of reading materials can help us know more about the 小题4: and help us grow into a(an)小题5: person.
特定工业区的空气环境质量标准执行( )类。
A.一
B.二
C.三
D.四