大气污染物具有刺激性和嗅味，应制订 A．一次最高浓度 B．日平_爱下问搜题

搜题请搜索小程序“爱下问搜题”

问题单项选择题

大气污染物具有刺激性和嗅味，应制订

A．一次最高浓度
B．日平均最高浓度
C．一次最高容许浓度
D．日平均最高容许浓度
E．C+D

答案

参考答案：C

填空题

用方框中所给的单词的适当形式填空。

rule, practice, join, after, lucky, for, on, read, by, early

       Emily has so many   1   in her home. She has to do her homework   2   school. She can't go out   3
school nights. She has to wash the dishes after dinner, then she can watch TV   4   half an hour. She
likes   5 . She usually reads at night. She has to be in bed   6   ten o'clock because she has to get up
    7   the next morning. She   8 a music club. She has to   9   the guitar every day. She doesn't think
she's  10 .

1. _____ 2. _____ 3. _____ 4. _____ 5. _____
6. _____ 7. _____ 8. _____ 9. _____ 10. _____

问答题简答题

翡翠的帝王绿色指什么