單項(xiàng)選擇題結(jié)扎止血帶時(shí)應(yīng)做明顯標(biāo)記,并定時(shí)放松,放松間隔時(shí)間為()

A.10~30min
B.30~60min
C.60~90min
D.90~120min
E.120~150min


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