Thursday, September 15, 2022
Wednesday, May 3, 2023
Wednesday, November 30, 2022
Thursday, April 11, 2024
Monday, September 12, 2022
Thursday, September 15, 2022
问题:燃气热水器烟道应有安全防风罩和风帽,选择风帽应符合哪些要求()。A、防止外物进入B、不影响抽力C、防止倒灌风...
Wednesday, March 27, 2024
问题:Φ189*4.5即表示外径为89mm,壁厚为4.5mm的管道。...
Monday, September 12, 2022
问题:一贮油罐高度为1m,油品比重r=0.9,油处于1m高度时油罐底部...
Thursday, September 15, 2022
Thursday, September 15, 2022
Monday, September 12, 2022
问题:中压燃气管道在置换过程中,气体的压力应该控制在()...
Thursday, September 15, 2022
Thursday, September 15, 2022
问题:安装时法兰螺孔应能保证螺栓自由插入,螺栓拧紧后应外露()扣。...
Thursday, September 15, 2022
Thursday, September 15, 2022
Wednesday, August 2, 2023
Thursday, September 15, 2022
问题:对较精密的设备所配套的过滤器应保证对应型号指定压力及最高流量的情...
Monday, September 12, 2022
问题:防腐绝缘层的防腐原理是利用防腐绝缘层来加大管道与土壤间的过渡电阻(),降低,减小电化学腐蚀达到防腐的目的。...
Tuesday, September 12, 2023
Monday, September 12, 2022