The boy, _____ leg was injured in the football match, was only 11 years old.

A．which

B．whose

C．who

D．whom

有关室间隔的描述，下列哪一项是错误的?

A.室间隔平面与人体呈45O斜位 

B.室间隔大部由心肌组成，统称嵴部 

C.室间隔的前后缘位前后室间沟 

D.室间隔上方有一小的卵圆形区域，非常薄，称为膜样间隔 

E.肌部间隔约占室间隔的70％