Which of the following statements concerning security valuation is FALSE（）

A. Accounting methods may differ substantially between countries.

B. To value any security, you need to know the projected cash flows, their timing, and the required rate of return.

C. If the return on new investments is less than the return the firm is earning on its existing investments, the firm is considered a growth firm.

哌替啶的临床适应证不包括（）

A.外伤疼痛

B.慢性钝痛

C.分娩止痛

D.手术后疼痛

E.癌症晚期疼痛