短语词组短語steep -dip critical angle 急斜臨界角steep p dip 急傾斜steep dip narrow vein 急傾斜極薄鑛脈steep dip coal seam 急斜煤層steep dip formation 陡傾搆造steep dip angle 陡傾角steep dip structure 高陡搆造steep dip and narrow vein 急傾斜薄鑛脈 返回 steep dip