包覆直角模
right angle’ s coating die
赤道直角坐标系
equatorial system of coordinates
垂直角观测
vertical angle observation
垂直角距离
distance by vertical angle
垂直角位置线
position line by vertical angle
大地直角坐标系
earth right angle coordinate system
大螺旋角直柄钻头
high-helix straight shank drill
单侧偏心直角弯头
single offset quarter bend