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【多选题】
矿井瓦斯的组成成分中，属于窒息性气体的有（）A.
氮气
B.
二氧化碳
C.
硫化氢
D.
一氧化碳
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反馈参考答案：
举一反三
【简答题】combat interactive blessing disappointment notification annoyance omit perplexed You can ____________ the last two sentences in the report.
【单选题】We can not______the risk of losing all that money. A. omit B. attach C. afford D. run
A.
omit
B.
attach
C.
afford
D.
run
【判断题】You can omit signatures at the bottom of an e-mail in an official situation as long as you have known well with each other.
A.
正确
B.
错误
【判断题】In writings, you can just omit the middle name, and the British people usually use the initial letter of the first name and the middle name.
A.
正确
B.
错误
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