pyramid cut round是什么意思

网络释义

1)pyramid cut round,锥形掏槽炮眼组2)sumper['sʌmpə],掏槽炮眼3)leyner cut,锥形掏槽4)v cut,角锥形掏槽5)michigan cut,平行空炮眼掏槽6)rhomdus cut,直眼菱形掏槽