关于螺内酯的叙述不正确的是（）

A.化学结构与醛固酮相似，与醛固酮竞争受体产生作用

B.有保钾排钠的作用，久用可致高血钾

C.有排钾的作用，长期应用可致低血钾

D.利尿作用弱而缓慢

E.主要用于醛固酮升高的顽固性水肿

With respect to claiming compliance with the CFA Institute Code of Ethics and Standards of Professional Conduct, which of the following statements is least accurate A firm:（）

A. is encouraged to adopt the Code of Ethics and Standards of Professional Conduct as the company's code and ethics.

B. can claim compliance if its code of ethics has been verified by CFA Institute.

C. can claim compliance after ensuring its code of ethics meets the principles of the Code of Ethics and Standards of Professional Conduct.