【单选题】【消耗次数：1】
床旁超声（POCUS）的主要特点是什么？
①
以教学需求为导向
②
以心肺、血管超声为主
③
无重点、无目的的超声检查
④
主要用于实验室研究
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超声造影的主要用途
①
提高超声对病灶的诊断和鉴别诊断能力
②
提高超声对病灶的检出能力
③
提高多普勒超声检测血流信号的能力
④
提高超声对病变治疗后的疗效判断能力
⑤
以上都是
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