Sunday, November 26, 2023
Wednesday, October 4, 2023
问题:高速旋转机构的轴承外壳与孔间间隙过大,运转时将可能产生(),引起振动,配合面严重磨损。...
Sunday, March 10, 2024
Sunday, April 7, 2024
Thursday, September 29, 2022
问题:单位质量燃料完全燃烧后,生成的水呈汽态时放出的热量为()。A、发热值B、低发热值C、高发热值D、燃烧热...
Sunday, April 7, 2024
问题:在正常操作时,如温度、压力不变,改变()也可以改变反应深度。...
Sunday, November 26, 2023
Monday, March 25, 2024
问题:为了提高泵效率,离心泵叶轮大多采用后弯叶片形叶轮,通常β2A在()之间。A、15°~40°B、5°~15°C、45°~60°D、55°~70°...
Sunday, April 7, 2024
问题:反应注水的作用是(),避免其结晶析出而堵塞设备。...
Monday, March 25, 2024
Sunday, April 7, 2024
问题:润滑油的油性随()的改变而变化,温度过高,()分解而破坏。...
Tuesday, March 12, 2024
Thursday, February 22, 2024
Thursday, March 2, 2023
Monday, May 15, 2023
Sunday, April 7, 2024
问题:为什么中央泵房两个出口中的一个出口必须用斜巷通到井筒?...
Monday, May 15, 2023
Thursday, September 15, 2022
Tuesday, November 29, 2022
问题:为什么水泵并联排水时并联运行的水泵扬程应基本相等?...
Wednesday, March 27, 2024