当发生瓦斯煤尘爆炸时,立即屏住呼吸,用()口鼻,防止吸入有毒的高温气体,避免中毒和灼 发布时间:2017-07-12 06:40 │ 来源:www.tikuol.com 题型:单项选择题 问题: 当发生瓦斯煤尘爆炸时,立即屏住呼吸,用()口鼻,防止吸入有毒的高温气体,避免中毒和灼伤气管、内脏。A、湿手捂住B、湿毛巾捂住C、手捏住
题型:单项选择题 A little knowledge is _______, because it can cause people to think they are more expert than they really are.A.expensiveB.ordinaryC.preciousD.dangerous 查看答案