腰椎椎管与椎体比例超过多少为椎管狭窄()
A.1:3
B.1:4
C.1:4.5
D.1:5
E.1:5.5
参考答案:C
—________?
—I am a doctor. [ ]
A. How are you
B. How do you do
C. What do you do
D. What do you want
骨与关节结核主要继发于()
A.消化道结核
B.泌尿系结核
C.肺结核
D.淋巴结核
E.胸膜结核