The basic unit of measure in a computer system is the（ ）. It is the smallest unit in computing. There are some other measures in a computer, such as Kilobyte,Megabyte, Gigabyte and so on.

A．Kilobyte

B．Bit

C．Gigabyte

D．Megabyte

关于膀胱结石，错误的是（）

A.T₁WI上呈高信号

B.腹部平片可以显示大部分膀胱结石

C.CT检查在膀胱腔内可见致密密度影

D.超声检查表现为膀胱腔内伴有声影的强回声光团

E.T₁WI和T₂WI上无信号