甲颏间距小于多少可能窥喉困难
A.5cm
B.5.5cm
C.6cm
D.6.5cm
E.7cm
参考答案:C
Our Party has always devoted great attention to raising the living _____ of the working people.
A.cost
B.situation
C.level
D.standard
某手术室容积为6m×6m×3.3m,共有10人,室内人员发菌量为1000菌落/(人·min),采用初、中效两级过滤器,滤菌效率分别为0.5及0.95,新风量为30%,室内菌数不高于350个/m3,大气含菌落数为2000菌落/m3,则所需通风量为( )m3/h。
A.1500 B.1629C.1853 D.2058