1 . 突出的
projectingprojecting突出的, 伸出的prologue
2 . 凸出的
projectingpasrt 凸出部projecting凸出的projection compass 投视式罗经
3 . 一投影
when cylinder surface and cone surface penetrate each other , if their axises intersect slantly and parallel to the frontal projectingplane , there will he special points in the penetrating line .本文对轴线斜交,且两轴线平行于某一投影面的圆柱面与圆锥面相贯时,相贯线上的特殊点进行探讨,从而得出了用辅助球面法不能