矩形截面锥形薄壁管
tapered thin-walled tube with rectangular cross-section
截锥形弹丸
Truncated-conical Projectile
截锥形压杆
cut-off-cone compressed bar
偏方锥面形[晶体]
trapezohedral [crystal] class
异型断面锥形电柱
tapered wire-pole with square cross-section
圆锥面截交线
intersection line of circular cones
折板形锥面网壳
hy rib pyramid lattice shell