弹力过度性皮肤的发病机制主要是（）。

A.网状纤维量的缺陷及形态上的异常

B.胶原纤维量的缺陷及形态上的异常

C.弹力纤维量的缺陷及形态上的异常

D.真皮含水量的增加，真皮基质黏性增加

E.血清中弹性硬蛋白酶抑制剂水平低下，导致弹力纤维破坏

Alien Chen, CFA, stated that, for the typical company, accounting profit tends to be greater than economic profit because explicit costs are generally not included in calculating accounting profit. Is the analyst correct with respect to the: Relationship between accounting, profit and economic profit Inclusion of explicit costs （） ①A. No No ②B. No Yes ③C. Yes No

A. ①

B. ②

C. ③