题目内容

当单个药包在岩体中埋置深度不大时，会在临空面上形成一个（）

A. 爆破大坑
B. 爆破漏斗
C. 临空面
D. 抵抗线

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预裂爆破尤其适用于（）围岩。

A. 稳定性较差的软弱围岩
B. 稳定性较好的坚硬围岩
C. Ⅰ级围岩
D. 以上均可

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Ⅰ、Ⅱ、Ⅲ级围岩宜用钻眼爆破的方式掘进。

A. 对
B. 错

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辅助眼在爆破过程中不起决定性作用，可有可无。

A. 对
B. 错

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Cet-6-1.7-Exercise 01J) For some people, the best solution is to live in a communal residence, with special services. This isn’t available everywhere, however. In Boston, for example, homeless people tend to be scattered in apartments throughout the city.

A review of extensive educational research shows no obvious academic advantage of single-sex schooling.
B. Some people think the best way to help the homeless is to provide them with communal housing.

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当单个药包在岩体中埋置深度不大时，会在临空面上形成一个（）

A. 爆破大坑 B. 爆破漏斗 C. 临空面 D. 抵抗线

预裂爆破尤其适用于（）围岩。

Ⅰ、Ⅱ、Ⅲ级围岩宜用钻眼爆破的方式掘进。

辅助眼在爆破过程中不起决定性作用，可有可无。

Cet-6-1.7-Exercise 01J) For some people, the best solution is to live in a communal residence, with special services. This isn’t available everywhere, however. In Boston, for example, homeless people tend to be scattered in apartments throughout the city.

A. 爆破大坑
B. 爆破漏斗
C. 临空面
D. 抵抗线