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当前学科：影像医学科
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在介入血管造影中，常使用血管活性药物提高造影诊断的准确性。下面药物中，不是血管扩张剂的是（）
A . 罂粟碱
B . 前列腺素
C . 肾上腺素
D . 妥拉苏林
E . 缓激肽
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