有关表皮样囊肿的描述，错误的是（）。

A.桥小脑角区多见

B.肿瘤为均匀等密度

C.病变边缘清楚

D.具有“钻缝”特点

E.增强扫描无强化

Deballasting a double bottom has what affect on KG（）.

A.KG is increased

B.KG is decreased

C.Kgis not affected

D.KG increases at light drafts and decrease at deep drafts