强直性脊柱炎的特征性X线表现是()

A．脊柱骨质破坏

B．关节表面破坏

C．关节面硬化

D．关节半脱位

E．椎旁韧带钙化骨化呈竹节样改变

The original experiment cannot be exactly duplicated. 

A.reproduced

B.invented

C.designed

D.reported