His father was really a ____ person. Once he made up his mind, nothing could change it. [ ]

A. familiar

B. brave

C. clever

D. stubborn

下面肺脓肿的描述中，错误的是（）

A.肺脓肿分急性、慢性两种

B.血源性肺脓肿常多发，一般为单侧

C.急性肺脓肿形成的空洞，壁厚，不规则，空洞内常有液平面

D.急性肺脓肿炎症阶段X线片上呈片絮状阴影，浓密较均匀

E.慢性肺脓肿阴影浓密，空洞可长时间无变化