爆炸危险区域内的通风,其空气流量能使易燃物质很快稀释到爆炸下限值的()以下时,可定为 发布时间:2017-12-02 08:22 │ 来源:www.tikuol.com 题型:单项选择题 问题: 爆炸危险区域内的通风,其空气流量能使易燃物质很快稀释到爆炸下限值的()以下时,可定为通风良好。A.20%B.25%C.30%D.35%
题型:单项选择题 单句改错1. I don't like football and basketball. 2. He does his homework very careful. 3. Running is much easy than cycling. 4. The weather is very well. Let's go out to play. 5. Table tennis is popularer than skiing in China. 查看答案