表面活性剂亲水亲油的强弱，可以用（）表示。
参考答案：亲水亲油平衡值
BLS时，如有条件需要尽早进行的是（）
A.早呼120
B.早心外按压
C.早电击除颤
D.早建立静脉通道
E.早高级生命支持
What ________ talked about when the teacher came into the classroom? [ ]
A. did they
B. have they
C. was being
D. were they
