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【单选题】
中等量胸腔积液的X 线特点是
A.
患侧肋膈角变钝、变平或消失
B.
患侧下肺野可见:上缘呈外低的弧形的均匀的高密度阴影
C.
患侧除肺尖透明外,余肺野呈均匀致密阴影
D.
透视下患侧高密度阴影不随体位而改变
E.
患侧肺野外侧无肺纹理
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