Sunday, September 11, 2022
Sunday, September 11, 2022
Sunday, September 11, 2022
问题:电气液压式调速器中的()与机械液压式调速器的()。...
Wednesday, July 5, 2023
问题:圆柱管螺纹、普通螺纹、圆锥螺纹、梯形螺纹不属于连接用的螺纹是()。...
Friday, July 21, 2023
问题:布氏硬度(HB)和洛氏硬度(HRC)之间的近似关系是()。...
Sunday, September 11, 2022
Sunday, September 11, 2022
Sunday, September 11, 2022
Sunday, September 11, 2022
Sunday, September 11, 2022
问题:螺纹的牙型、外径、螺距都符合标准的,称为标准螺纹。...
Saturday, April 13, 2024
问题:制动器凸环齿顶面与托板下部凹槽的搭接量Δhi<()mm时,应更换...
Sunday, September 11, 2022
问题:深井泵的效率是水力效率、容积效率、机械效率三者之()。...
Sunday, September 11, 2022
Sunday, September 11, 2022
Sunday, September 11, 2022
问题:若某刚体在平面任意力系作用下平衡,则此力系各分力对刚体()之力矩的代数和必为零。A、特定点;B、任意点;C、重心;D、形心。...
Saturday, August 26, 2023
Sunday, September 11, 2022
Friday, February 16, 2024
问题:游标卡尺使用时,可以不检查游标卡尺的立尺与副尺零线是否对齐及内外...
Sunday, September 11, 2022
问题:开关阀门不应用力过猛,开启时不要开过头,当全开启时可倒回一圈。...
Monday, February 27, 2023