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（）。【拓展应用】下列几个方案中一定能证明CO 2 与NaOH溶液反应的是

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将以下英文段落翻译为中文 Breakfast meetings rarely last more than an hour. They imply certain urgency and are often convenient during business travels. Lunch is usually best for getting to know a guest a bit better. People do not have to talk about business, of course. Afternoon tea or coffee is a relaxed way to spend 45 minutes or an hour talking about business. Dinner is a more formal business event. Generally, this is not a time to talk about business, but rather a time to get to know the other person and enjoy each other’s company. （）

He was overweight and decided to be an （）

已如无风险收益率8%，市场预期收益率18%，某组合投资由两只股票A和B组成，市价分别为30万元和20万元，b系数为1.8和0.8。1)计算股票A、B的预期收益率。2)组合投资的b系数和预期收益率。

C公司估计今年硅片的销售额为300万元。由于这是一个资本密集型的产业，固定经营成本为100万，变动成本率为40%。公司的债务包括20万元、利率为10%放入银行贷款和1000万元息票率为12%的债券。公司在外发行了100000股优先股，每股支付优先股股利为9.60元。若税率为30%清计算。1)计算该公司的经营杠杆系数(DOL)。2)计算该公司的财务杠杆系数(DF)。