【单选题】Most scientists in the world today firmly believe the effective means to stop global warming is to reduce emissions of air _____.
【简答题】防水卷材的搭接宽度应符合规范要求,铺贴双层卷材时,上下两层和相邻两幅的接缝应错开( )幅宽,且两层卷材不得互相垂直铺贴A. 1/4~1/3 B. 1/3~1/2 C. 1/4~1/2 D. 1/5~1/3
【单选题】限速器安装要牢固,它的绳轮应垂直与地面,垂直度应不大于( )
【判断题】集货、分拣和配货是配送中心的主要、独特的业务。