In this paper, we prove a sufficent and necessary condition of existence for the solution of a kind of sublinear singular bound ary value problem.

证明了一类含脉冲次线性奇异边值问题解存在的充要性条件，推广了以前的相应结果。

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Objective:To analyze X-ary and CT findings and evaluate the clinical value and limitation of X-ray and CT in diagnosis and directing management of vertebral burst fractures (VBF).

目的：分析脊柱爆裂骨折的X线、CT表现，并评价其诊断价值和限度以及对临床治疗中的指导作用。

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