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当前学科：十二、呼吸系统疾病
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患儿，男，4个月，因嗜睡、抽搐昏迷1小时来急诊。查体：体温38.4℃，前囟膨隆，呼吸44次/分，双肺散在细湿啰音，心率140次/分，肝肋下2cm。血常规：白细胞22×10
9
/L（2.2万/mm
3
），N75%。最需要做的是哪项检查（）
A . A.脑脊液检查
B . 头颅CT
C . X线胸片
D . 血钙
E . 心电图
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