短語詞組短語heavy oil layer 稠油層thin heavy oil layer 薄層稠油heavy medium layer 重介質(zhì)層heavy layer ventilation 厚層通風(fēng)heavy -oil layer 稠油層heavy curtain covering layer 帷幕狀保護(hù)層heavy hanging wall layer 厚層heavy oil tested layer 稠油層heavy miscellaneous fill layer 大面積深厚雜填土 返回 heavy layer