My sister often needs help with her study,      ?

A．need she

B．needn’t she

C．doesn’t she

D．does she

肺部CT的检查技术描述错误的是（）

A.平静呼吸的吸气未屏气扫描

B.范围为肺尖至肺底

C.层厚、间隙均为10mm

D.多需增强扫描

E.仰卧位