单项选择题
A.1级 B.2级 C.3级 D.4级 E.5级
A.ASA1~2级,麻醉死亡率近1/10000 B.ASA3级,麻醉死亡率近28/10000 C.ASA4级,麻醉死亡率近74/10000 D.ASA5级,麻醉死亡率近155/10000 E.以上都对
A.American Societyof Anesthesiologists B.American Stomatological Association C.American Surgical Association D.American Standard Association E.American Statistical Association