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...
Cathay Pacific flies daily non-stop to Hong Kong from Heathrow...国泰航空公司每天都有从希思罗机场直飞香港的航班。In Bagdad, Mark was Patriarch for all the cities of Cathay.他们俩在巴格达时, 马尔谷被祝圣为“国泰各城市”的总主教.Cathay Pacific's hiring British pilots...
This hotel gives preferential treatment to people who stay in it regularly.旅馆给那些常客优惠待遇.We have first - class quality, first - class service, preferential prices to your commitments, Burley is your preferred payment.我们以 一...
Equation between inter - yarn air permeability and parameters of fabric structure was deduced based on Hagen - Poiseuille hydromechanics.利用哈根伯肃叶定律,推导出机织物的纱线间孔隙透气量与织物结构参数的关系式.Equation between inter - yam air permeability ...