手术区皮肤消毒范围最少距手术切口()
A.5cm
B.10cm
C.15cm
D.20cm
E.30cm
参考答案:C
解析:手术区皮肤消毒范围最少距手术切口15cm。
He left ________with my secretary that he would call again in the afternoon and he did keep his______. [ ]
A. words; words
B. word; words
C. word; word
D. the word; words
下列实例中,既具有动能又具有重力势能的是 [ ]
A、水平赛道上飞驰的赛车
B、戏水者从高处飞速滑下
C、打桩机将重锤举在高处
D、张弓待发时被拉开的弦