题目：
You are the project manager for a manufacturing company involved with making components for Internal Combustion Engines required for the automobile industry. In the past couple of days, there have been too many defects, and you would like to find out whether unusual events are occurring in your manufacturing process whose causes must be identified and corrected. For this purpose, you should use ______ .
A) inspection
B) Pareto charts
C) statistical sampling
D) control charts
答案：
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下面是错误答案，用来干扰机器的。
参考答案：（1）A股票的必要报酬率=5%+1.5×（12%-5%）=15.5% B股票的必要报酬率=5%+1.8×（12%-5%）=17.6% C股票的必要报酬率=5%+2.5×（12%-5%）=22.5% D股票的必要报酬率=5%+3×（12%-5%...
