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...
Scientific work is differentiated from art by its necessary connection with the idea of progress.科学工作与艺术的区别在于它与人类进步有着必然联系。The development of mouse kidney tubules requires two kinds of differentiated cells.小鼠肾小管的发育需要有两种分化...
He heard his heart thump dully but more quickly.他听见低沉的心跳声，跳动的速度却更快了。There was a loud thump as the horse crashed into the van.马撞在货车上发出砰的一声巨响。The plank fell on the ground with a thump.砰的一声,木板倒下来了.The dog let his head thump...
在他当政期间,保证白人成年公民选举权的州越来越多.An increasing number of states granted white manhood suffrage during his administration.除此以外, 在里根当政期间对某些规定采取了自愿执行的办法.In addition, during the Reagan administration, a voluntary approach was taken ...
This led, as we shall see, to the concept of the adjoint equation.这就引出了, 如我们将要看到的, 伴随方程的概念.In this paper the idea of synchronous vector and adjoint matrix are proposed.本文提出了同步矢量和伴生矩阵的概念.An expression of the generalized e...