1931年Dos Stantos首先用针穿刺__________动脉完成了最早的动脉造影;20世纪40年代,瑞典学者Jonsson首先用同轴针经皮穿刺__________动脉,将细针芯抽出,通过外套管送入细银线,通过细银线作引导将外套针向下送至__________处,行血管造影。
— ___________________
— Once or twice a week.
A campus emergency ______ occur at any time of the day or night, weekend, or holiday, with little or no warning.
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