井口油桿

polish rod的用法和样例:

例句

  1. The new assembly can make the joint of the polished rod pass through, therefore can meet the need of new oil production technology.这种密封盒可以使比光杆杆体直径大得多的光杆接头通过,能满足新的采油工艺需要。

The United States and Poland have signed an agreement to station elements of a U.S. missile defense shield on Polish soil. In this report from Washington, Senior Correspondent Andr de Nesnera looks at the agreement which is vehemently opposed by Rus

发表于:2019-01-13 / 阅读(51) / 评论(0) 分类 VOA标准英语2008年(八月)

By Paula Wolfson White House 10 March 2008 President Bush says the United States will help modernize the Polish military as part of a deal to put components of a missile defense system in Poland. VOA's Paula Wolfson reports the announcement came as t

发表于:2019-01-31 / 阅读(36) / 评论(0) 分类 VOA标准英语2008年(三月)

图片1 图片2

发表于:2019-03-02 / 阅读(108) / 评论(0) 分类 加州英语分级GK

图片1 图片2

发表于:2019-03-02 / 阅读(105) / 评论(0) 分类 加州英语分级GK

图片1 图片2 图片3

发表于:2019-03-02 / 阅读(100) / 评论(0) 分类 加州英语分级GK

图片1 图片2

发表于:2019-03-02 / 阅读(114) / 评论(0) 分类 加州英语分级GK