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问题 选择题

某同学利用发生了向光弯曲的燕麦胚芽鞘，制作成切片观察,并绘制了背光侧和向光侧的细胞形态示意图(如下图)。结合课本知识可得出的结论是：

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A．生长素促进生长的原理是能促进：细胞分裂  胚芽鞘的弯曲部位是：①

B．生长素促进生长的原理是能促进：细胞伸长  胚芽鞘的弯曲部位是：②

C．生长素促进生长的原理是能促进：细胞分裂  胚芽鞘的弯曲部位是：②

D．生长素促进生长的原理是能促进：细胞伸长  胚芽鞘的弯曲部位是：①

答案

答案：B

单项选择题

某服装厂生产的产品主要是秋冬装，大部分是手工制衣。由于生产季节性强，因此每年夏秋季的时候，企业便开始扩大生产量，增加工人，增加工时，提高工资。

在该厂，如果工资率从8元/小时上升到10元/小时，工人的劳动的时间也从8小时/天增加到10小时/天，此时，该劳动力供给曲线( )。

A．富有弹性

B．具有单位弹性

C．缺乏弹性

D．弹性为零
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单项选择题

Helmut Humm, manager at a large U. S. firm, has just been assigned to the capital budgeting area to replace a person who left suddenly. One of Humm’s first tasks is to calculate the company’s weighted average cost of capital (WACC). Humm finds clear notes on the target capital component weights. Unfortunately, all he can find for the cost of capital components is some handwritten notes. He can make out the numbers, but not the corresponding capital component. So, he has to guess. Here is what Humm deciphered: Target weights : wd = 30% , wps = 20% , wce= 50% , where wd, wps, and wce are the weights used for debt, preferred stock, and common equity. Cost of components (in no particular order) : 6.0% , 15.0% , and 8.5%.The cost of debt is the after-tax cost. If Hummguesses correctly, the WACC is:（）

A. 9.2%.

B. 11.0%.

C. 9.0%.
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