2025-09-09 17:56 浏览次数 8
上闭集合
upper die set上模座
Upper reflectance set up上反射法
Upper Approximation Set上近似集
upper level set上水平集
upper ordinate set上纵标集
upper closed set上闭集
upper contact set上接触集
weakly upper semiclosed set弱上半闭
The upper set of wrench flats belong to the packing nut, which is threaded into the valve body.
扳手面上面的那个属于衬垫螺母,它是通过螺纹旋进阀体的。