上梯子作业要按规范戴好安全帽,为便于上下传递工具,允许两人在梯子上作业,地面不需要有 发布时间:2018-02-20 12:41 │ 来源:www.tikuol.com 题型:判断题 问题: 上梯子作业要按规范戴好安全帽,为便于上下传递工具,允许两人在梯子上作业,地面不需要有人监护。
题型:判断题 如图所示,某高层建筑空调水系统,(1)管路单位长度阻力损失(含局部阻力)为400Pa/m;(2)冷水机组的压力降0.1MPa;(3)水泵扬程为30m;试问系统运行时A点处的压力约为下列何值()。A.11mH2OB.25mH2OC.16mH2OD.8mH2O 查看答案
题型:判断题 — Where is Zhang Ming?— Oh, don't you know he _____ to Beijing to see his parents and he'll be back tomorrow.[ ]A. has goneB. has beenC. had gone 查看答案