直埋蒸汽管道玻璃钢外护管的最小壁厚有何要求?
参考答案:玻璃钢外护管的最小壁厚,应满足刚度和冲击荷载的要求,外径与壁厚的比值不应大于100,其最小壁厚不应小于3.0mm。
The garden _______ while they were away from here. [ ]
A. took good care of
B. was taken good care
C. was taken good care of
D. was taking good care
在设计合同履行过程中,发包人应提供设计依据资料,以下叙述中正确的有()。
A.对资料的正确性负责
B.遵循合理设计周期的规律
C.提供设计文件中需选用的标准图
D.按时提供设计依据文件和基础资料
E.必须一次性向设计人提交设计的依据文件和相关资料