问题
选择题
下列气体和空气混合点燃,可能发生爆炸的是( )
A.二氧化碳
B.氢气
C.氧气
D.水蒸气
答案
答案:B
下列气体和空气混合点燃,可能发生爆炸的是( )
A.二氧化碳
B.氢气
C.氧气
D.水蒸气
答案:B
用所给单词的适当形式填空。每个单词限用一次。
小题2:My English is a little poor. I want to improve it. 小题3:Confucius is a great thinker who is the of all the Chinese. 小题4:When Chang’e Ⅰlanded ________ on the earth, all Chinese were cheerful. 小题5:The dustbins in the streets should be every day. |