安全通道及安全防护棚顶部应铺设双层水平硬质防护,层间距不得小于()。 A.200mm 发布时间:2018-04-29 04:34 │ 来源:www.tikuol.com 题型:单项选择题 问题: 安全通道及安全防护棚顶部应铺设双层水平硬质防护,层间距不得小于()。A.200mmB.400mmC.600mmD.800mm
题型:单项选择题 从方框中选词,并用其适当形式填空。Chinese she be run dictionary1. My favourite sport is ______. 2. ______ there any maps in your classroom? 3. There are five ______ on my desk. 4. Linda is my friend. ______ parents are doctors in a hospital. 5. Lingling is from ______ and she speaks Chinese very well. 查看答案
题型:单项选择题 鼓风机在低速时负载转矩很小,升速时间可以快些,但随着转速的增加,负载的转矩增大较多,升速过程应减缓一些,采用()升速方式比较适宜。A.正弦方式B.线性方式C.S形方式D.半S形方式 查看答案