Which of the following statements best describes the investment assumption used to calculate an unweighted price indicator series（）

A. An equal dollar investment is made in each stock in the index.

B. A proportionate market value investment is made for each stock in the index.

C. A proportionate market capitalization is made for each stock in the index.

继发性腹膜炎最主要的临床表现是

A．腹痛

B．叩出移动性浊音

C．腹膜刺激征

D．高热、脉快、疲乏

E．肠鸣音消失