竹节状脊柱
参考答案：
强直性脊柱炎病变晚期在X线片上可见炎症引起纤维环及前纵韧带深层的骨化，形成平行脊柱的韧带骨赘，使脊柱外观呈竹节状，故称竹节状脊柱。
The sailors returned twenty days later, .[ ]
A. felt ill, tired and unhappy
B. illness, tiredness and unhappiness
C. feeling ill, tiresome and unhappy
D. ill, tired and unhappy
简述开放经济对投资结构决定的影响
