题目内容

Why does Speaker2, Rick, say his online community is "a very 21st-century community"?

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What does he say about "the best blogs"?

What two things does Speaker3, Abbie, do on her favorite website?

How often does she use it?

某方案设计总产量为3000吨，产品售价为1468元/吨，固定总成本为180万元，单位变动成本为950元/吨，假定量本利之间的关系为线性。试求产量和生产能力利用率表达的盈亏平衡点。