综述了石油钻杆接头失效的十一种主要形式.Eleven mare modes of tool joint failures are summarized.那个钻杆的丝扣坏了, 换另外一根.That pipe thread is bad. Use another one instead.本文还介绍了微型钻杆测试系统压力瞬时分析方法.A systematic pressure transient analysis method for min...
Tracking assigns some students to college prep and others to vocational programs.按照能力，一些学生被分到大学预科班，另一些则被分到职业培训班。As a vocational teacher I could pretty much pick and choose my work.作为一名职业教师，我几乎可以随意挑拣自己的工作。Vocational cours...
The trucking company was able to sustain the severe fuel shortage.该卡车公司能经受得了这严重的汽油短缺.Limousine and trucking companies are always their fronts.高级轿车和运货卡车服务公司常常是他们的掩护机构.Shipping lines, airlines, trucking companies and railr...