问题 问答题 简答题

简述掉钻头事故的原因及预防措施。

答案

参考答案:

钻头脱落原因:

(1).回转钻进时由于负荷大,联接法兰的螺栓被剪断。冲击钻进时,钢绳较细磨损严重,引起断绳,钻头调入孔底。

(2).联接法兰的螺栓未旋紧,钻进时螺栓脱落。冲击钻进时,钢绳绳卡未卡进,使钻头脱落。

(3).法兰焊接强度低或钻杆材质差,使其被扭断。冲击钻进时,钻头加重杆疲劳折断。

掉钻头事故的预防:

(1).选用高强螺栓,冲击钻进时使用优质符合规范的钢丝绳,适用旧钢绳时应随时检查。

(2).法兰联接螺栓要1上进,冲击钻进卡进绳卡或适用多个绳卡。

(3).使用强度较高的材料作钻杆,提高焊接质量,冲击钻进时调整钻进参数;铸铁加重杆帮补高强钢材。

阅读理解

阅读表达,阅读短文,按要求完成短文后的各项任务。

We are in a world full of competition. Our parents compete with others in their offices, our brothers and sisters compete with others in their colleges, and we compete(1)_______ our ________in school. Most of us give up in the face of competition and will never be successful. Why can’t we do better than others? One important reason is that we have no self-confidence.

In fact, everyone was born equal. You can do what others do. Although your classmates may be better than you in some ways, (2)你可能在其他科目上比他们好. So everyone has his or her advantages. Don’t look at things from a single point of view. Try to find your own advantages, and believe that you can do better than others in those ways.

Competition is not so terrible. Don’t be afraid of it. And don’t be afraid of those classmates who are better than you. Remember that self-confidence is the first step to success. Believe in yourselves, and you will be successful one day. 

小题1:在①句的空白处分别填入一个适当的词使句意完整,上下文通顺:

                  

小题2:将②句译成英文。                                                          

小题3:回答问题:Why can’t we do better than others?

                                                                              

小题4:在文中找出与下面句子意思相近的句子,并写出该句。

You should not be afraid of competition.

                                                                              

小题5:在文中写出最能表达该短文主题的句子。

                                                                      _________

判断题