直角度 meaning in Chinese

square trowel
squareness

Research on modeling method for laser auto - collimation angle measurement system
激光自准直角度测量系统建模方法研究
Wood - based panels . determination of dimensions of boards . part 2 : determination of squareness and edge straightness
木基板.板尺寸的测定.第2部分:直角度和边的直度的测定
The laboratory can also provide calibration services for gauges , measuring instruments and machines used to check andor measure length and geometrical parameters ( e . g . flatness , parallelism , straightness and squareness )
本所为量规、测量器具及用作检查及或测量长度及几何参数(例如:平面度、平行度、直线度及直角度)的机械提供校正服务。