题目：
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%.
答案：
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下面是错误答案，用来干扰机器的。
参考答案：大气中的SO2沉降途径有两种：干式沉降和湿式沉降。 SO2干式沉降是SO2借助重力的作用直接回到地面的，对人类的健康、动植物生长以及工农业生产造成很大危害。SO2湿式沉降就是通常说的酸雨，它对生态系统...
都是总体参数θ的无偏估计量，下列说法中正确的有（）。
