问题
单项选择题
氧硫化碳通常采用剂量为20g/m3以内,密闭时间应为()。
A、5d
B、4d
C、3d
D、2d
答案
参考答案:A
氧硫化碳通常采用剂量为20g/m3以内,密闭时间应为()。
A、5d
B、4d
C、3d
D、2d
参考答案:A
用方框中所给单词的适当形式填空,每个单词限用一次。(每空限填一词)
小题2:June 5th is an ________ day. It is World Environment Day. 小题3:The __________ were very happy because they catch many fish. 小题4:You can never be_______ , unless you work hard. 小题5:They can become unhappy___________ if they can’t deal with the problems. |