以下检查项目中哪项是婚前检查的常规必检项目

A．B型超声波检查

B．艾滋病筛查

C．女性 * * 分泌物滴虫、真菌检查

D．染色体检查

E．心电图

All of the following negatively affect shareholders’ proxy voting rights, EXCEPT:（）

A. allowing proxy voting by means other than a paper ballot. 

B. requiring attendance at the annual meeting. 

C. scheduling the annual meeting on the same day as other companies in the area, but in different locations.