若手术时间超过3小时,或者手术时间长于所用抗菌药物半衰期的,或者失血量大于1500毫升的,手术中应当对患者追加合理剂量的抗菌药物。
参考答案:对
The child _____ parents were killed in the air crash is now living with his aunt.
A.whose
B.his
C.who
D.whom
慢性支气管炎呼吸功能开始出现异常,最主要的表现为
A.小气道阻塞B.FEV1/FVC<70%C.MV降低D.RV增加E.Dlco降低