管道内的流体速度,一般情况下,在()处流速最大。A、管道上部B、管道下部C、管道中心线D、管壁...
Friday, March 22, 2024
Wednesday, January 17, 2024
Wednesday, January 25, 2023
防雷、防静电设施应齐全完好;建筑物防雷接地电阻不应大于()Ω;电...
Monday, September 12, 2022
消防水泵启动时,应检查泵的进出口阀门处于开启状态,旁通阀处于开启状态。...
Friday, March 22, 2024
Tuesday, March 26, 2024
卡套连接方式对被连接管道的要求是()。A、卡套密封锥度圈与管子硬度相同B、卡套密封锥度圈能卡入管子外壁C、管子能卡入卡套密封锥度圈D、为了防止脱落,管子外壁应粗糙...
Thursday, December 21, 2023
Thursday, March 2, 2023
Thursday, June 15, 2023
门站对接收()的天然气进行过滤、计量、调压、检测、加臭后,送到()。...
Sunday, February 11, 2024
Sunday, January 29, 2023
两台加臭泵为一开一备,当前运行加臭泵出现哪些情况时,应关闭此加臭泵,开启另一台加臭泵?...
Tuesday, February 7, 2023
球阀的结构有阀体、球体、密封结构和执行结构(传动装置)组成。...
Monday, September 12, 2022
Thursday, March 21, 2024
Saturday, March 2, 2024
天然气门站的安全附件的检测时间的规定是:();();()。...
Sunday, September 11, 2022
Sunday, November 27, 2022
Thursday, April 25, 2024
Monday, September 12, 2022
闸板阀的结构主要由阀体、阀盖、阀杆、阀板、密封圈和传动装置等部件组成。...
Thursday, June 15, 2023