题目内容
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。
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The Role of the Stock Exchange？
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.
1.The certificate that is issued to investors who lend money is also called abond
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