问题:流体阻力产生的原因()和()管壁的粗糙度与管长、管径。
Saturday, September 17, 2022
问题:中低压法兰密封面结构形式有()、凹凸面式密封、榫槽面式密封。
Wednesday, November 1, 2023
Tuesday, October 4, 2022
问题:电气设备不停电,电压等级在10kV及以下时安全距离是()米,电压等级在35kV及以下时安全距离是()米。
Friday, November 10, 2023
Thursday, January 4, 2024
Friday, April 7, 2023
Friday, January 19, 2024
Thursday, January 4, 2024
Friday, June 23, 2023
问题:电焊作业着火时,首先要拉断(),然后扑救,可用干粉、二氧化碳等灭火器。
Tuesday, September 13, 2022
Wednesday, January 3, 2024
Thursday, January 4, 2024
问题:使用砂轮磨削时,工作者应站在(),不要站在砂轮的正对面。
Friday, November 10, 2023
Friday, January 19, 2024
Saturday, November 25, 2023
Saturday, September 10, 2022
Friday, January 19, 2024
Friday, January 19, 2024
问题:色谱法实质是混合物中各个组分在()的两相之间()而使混合物得到分离。
Wednesday, January 3, 2024
问题:动力消耗定额指生产单位产品所需()()()和()的消耗量。
Friday, January 19, 2024