危险化学品安全技术过滤式防毒面具适用于( )。 A.低氧环境 B.任何有毒性气体环 发布时间:2017-07-01 22:14 │ 来源:www.tikuol.com 题型:单项选择题 问题: 危险化学品安全技术过滤式防毒面具适用于( )。A.低氧环境B.任何有毒性气体环境C.高浓度毒性气体环境D.低浓度毒性气体环境
题型:单项选择题 选用方框内所给词的适当形式填空。close I science work practice1. —Don't forget to keep the windows _____ when you leave. —OK, I will.2. It's late. Wang Tao stopped _____ and went to bed.3. —Who did you learn to skate from? —Nobody. I taught _____.4. We all know Edison and Einstein were both _____. They invented many great things.5. —Where were you doing at 8:00 yesterday evening? —I _____ English at the school English club. 查看答案
题型:单项选择题 某市高档写字楼进行装修改造,主要施工项目有:吊顶、地面(石材、地砖、木地板)、门窗安装、墙面为墙纸、乳胶漆;卫生间墙面为瓷砖,外立面采用玻璃幕墙,回廊采用玻璃护栏,门窗工程、吊顶工程,细部工程等采用人造木板和饰面人造木板。跨度大于15m的吊顶,应在主龙骨上每隔()加一道大龙骨,并垂直主龙骨焊接牢固。A.5mB.10mC.15mD.20m 查看答案