题目内容

螺旋钻孔机，是钻孔成桩机械之一，适用于（）、（）、砂层、湿陷性黄土及含有少量粘土层作业。

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人工挖孔桩必须遵守（）的原则，即必须做到挖一节土，做一节（），且孔内开挖作业必须待护壁稳定后再挖下一节。

To become a successful ______, one should have a working knowledge about the business he or she plans to start.

A. company
B. corporation
C. entrepreneur
D. worker

The business was ______ from Owen four years ago.

A. acquired
B. acted
C. required
D. repaired

Once we have the _____ information, we can make a decision.

A. relevant
B. popular
C. instant
D. typical