— All the lights have gone out in the office building.

— Yes, they have ______ electricity. [ ]

A. cut off

B. cut up

C. cut in

D. cut down

符合脊柱结核MR信号表现的是（）

A.T₁WI和T₂WI均为低信号

B.T₁WI为低信号，T₂WI为高信号

C.T₁WI和T₂WI均为高信号

D.T₁WI为高信号，T₂WI为低信号

E.T₁WI和压脂像均为低信号