A down - hole autotracking well pumping unit different from the conventional pumping unit was designed.针对抽油技术的现状和存在的问题,设计了一种不同于有杆抽油方法的井下自动跟踪式抽油装置.It is autumn and they are pumping water out of the swimming pool.入秋了, 他们正在...
Airports have joined seaports as ports of entry for the visiting foreigner.机场和海港一样成为来访的外国人的入境关口.Sanya has 16 seaports, 10 islands and 180 km of coastline.三亚有16个港口 、 10个海岛和180公里的海岸线.She had picked up rare coins in seaport...
She is hunched forward over the wheel with a maniacal expression.她弓身伏在方向盘前，表情像疯了一样。He was almost maniacal in his pursuit of sporting records.他近乎发疯般地追求着打破体育纪录。Everywhere was tumult, exultation , deafening and maniacal bew...