Mining backfilling is restrained by relatively high filling cost.充填采矿由于充填成本较高而制约着其发展.High - water rapid - hardening backfilling with whole tailings is a new developed backfilling technology.全尾砂高水速凝充填技术是一项新近发展起来的充填技术.Its ...
神父在亮光下皱起了眉头，一脸疑惑。The priest frowned into the light, his face puzzled.一想到要跟卡米拉一起吃饭，他皱起了眉头。He winced at the thought of dining with Camilla.米奇看到几个人正在喝酒时皱起了眉头。Midge's forehead furrowed as she saw that several were drink...