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井巷掘进中的爆破参数包括、、和

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设计出巷道净断面后，须风速验算。若风速超过允许的最高风速，应修改断面尺寸，直至满足通风要求。

A. 对
B. 错

The Role of the Stock Exchange？

A. Raising capital for businesses
B. Mobilizing savings for investment
C. A.Facilitating company growth
D. Achieving corporate governance

Astockbrokeris a person whose job is to buy and sell 、_、for people who want to invest money.

When a government or company issues abond, it borrows money from investors.

A. 对
B. 错