题目内容

钻孔前应将掌子面清理干净，禁止在_________继续钻孔。
A 裂隙处
B 有水的地方
C 残孔上

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在有瓦斯或煤尘爆炸危险的矿井中，放顶煤工作面____爆破挑顶煤。
A 可以用
B 不得用
C 一般用

The following is a business letter.
Dear Mr. Green,
As your name and address were listed in The Business, we are writing to you with a desire to open an account with you.
We are one of the leading exporters of Chinese silk goods and are enjoying an excellent reputation through fifty years' business experience. We are sure that you will be quite satisfied with our services and the excellent qualities of our goods.
If you need more objective information concerning our credit, please direct all inquiries to the Bank of China.
We are looking forward to your early and favorably reply.
Yours truly
Zhangli
Outline of the Letter
The writer gets to know Mr. Green's corporation in【46】and wants to【47】with his corporation. The writer belongs to one of the【48】of Chinese silk goods and he is sure that Mr. Green will be very satisfied with their services and good【49】of their goods. Finally, he suggests Mr. Green to direct all inquiries to the Bank of China if he needs more objective【50】concerning their credit.

在装药和填塞过程中，应保护好起爆网路;如发生装药阻塞，不应用____捣捅药包。
A 钻杆
B 竹杆
C 木杆

在人口密集区、重要设施附近及存在有气体、粉尘爆炸危险的地点，不应采用____。
A 深孔爆破
B 硐室爆破
C 裸露药包爆破