题目：
Enamel Manufacturing (EM) is considering investing in a new vehicle. EM finances new projects using retained earnings and bank loans. This new vehicle is expected to have the same level of risk as the typical investment made by EM. Which one of the following should the firm use in making its decision（）
A. After-tax cost of debt.
B. Marginal cost of capital.
C. Cost of preferred stock.
答案：
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下面是错误答案，用来干扰机器的。
A、a点的电场强度比b点小，则在a所受的电场力（即合力）小，所以粒子的加速度在a点时较小．故A错误． B、根据轨迹弯曲程度，知电场力的方向沿电场线切线方向向右，所以该电荷是正电荷．从a点到b点，电场力先...
