【单选题】
上消化道出血病因诊断的首选检查措施为___
A. X线钡餐造影检查
B. 选择性动脉造影
C. 内镜检查
D. 化验检查
E. 吞线试验
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答案
C
解析
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对于小儿体液特点的表述，正确的是___
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下列关于肺血管的描述错误的是___
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B. 肺循环是一个高压、高阻力循环系统
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小儿先能抬头后能坐、之后能走是遵循了下列哪项发育顺序___
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