If significant movement of a structure is anticipated that could affect dimensionalchecking, an envelope of permissible positions shall be specified.
当预计到结构体的明显移动会对尺寸检查造成影响时，应规定允许的位置范围。
2
It guides the formation of the three-dimensional numerical bender's data and supplies a algorithm of checking the accuracy of the drawing through observation the three-dimensional virtual image.