题目内容

Task Three: Focusing on the main ideasPlease complete the following paragraph with key information from the text.(填写对应序号)Yu Minhong has realized his Chinese dream after he failed to pursue his dream in America. He was born in a poor ____1___family, his father's ____2____ and _____3_____ influenced his whole life. In the ____4_____ 1980s, Yu wanted to pursue his American dream, but he failed repeatedly to obtain a ____5_____. Disappointed, he started to help others _____6_____ their American dreams. He quit his job as an English teacher at Peking University and started up a ____7_____ in 1993 to help students develop their English skills. Over all the years, Yu has run into many difficulties and _____8_____, but his ____9_____ and _____10_____ attitude lead him to success. In this way, he sets a good example for other young people in chasing their dreams.

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在进行地下洞室的爆破开挖时,整个断面炮孔中首先起爆的炮孔是()。

A. 掏槽孔
B. 周边孔
C. 崩落孔
D. 锥形孔

在进行地下洞室的爆破开挖时,沿断面设计边线布置,一般最后起爆的炮孔是()。

A. 掏槽孔
B. 周边孔
C. 崩落孔
D. 锥形孔

下列关于地下工程开挖与支护的说法中,正确的是( )。

A. 钻爆法施工尤其适合岩石坚硬、长度相对短的洞室施工
B. 地质条件良好且岩石硬度适中的圆形断面隧洞可采用掘进机开挖
C. 钻爆法开挖时,洞室的轮廓主要取决于崩落孔的布置
D. 钻爆法开挖时,掏槽孔的爆破效果是影响隧洞开挖进尺的关键
E. 锚喷支护特别强调支护时机

地下洞室钻爆法开挖时,按其作用原理、布置方式和有关参数的不同,将炮孔可分为三类:( )、( )、( )。

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