短语词组短语steep -dip critical angle 急斜临界角steep p dip 急倾斜steep dip narrow vein 急倾斜极薄矿脉steep dip coal seam 急斜煤层steep dip formation 陡倾构造steep dip angle 陡倾角steep dip structure 高陡构造steep dip and narrow vein 急倾斜薄矿脉 返回 steep dip