A firm is planning a $25 million expansion project. The project will be financed with $10 million in debt and $15 million in equity stock (equal to the company’s current capital structure). The before-tax required return on debt is 10 percent and 15 percent for equity. If the company is in the 35 percent tax bracket, what cost of capital should the firm use to determine the project’s net present value (NPV)（）

A. 11.6%.

B. 9.6%.

C. 10.5%.

患者，男，72岁，双侧下后牙缺失，戴可摘局部义齿1周后，咀嚼食物时，右缺隙侧与基托吻合部黏膜出现灼痛，局部黏膜有红肿、溃烂，停止戴义齿后症状缓解，再次使用出现同样症状。

经过上述处理后患者在戴用义齿行使功能时灼疼感消失，但开始出现咬颊，你认为是什么原因造成的（）

A.咬颊侧人工牙与对颌牙的覆盖过小

B.咬颊侧人工牙与对颌牙的覆盖过大

C.咬颊侧人工牙与对颌牙的覆过小

D.咬颊侧人工牙与对颌牙的覆过大

E.咬颊侧人工牙的排列纵曲线错误