单项选择题
A.苍白B.发红C.发绀D.色素沉着
A.30-50cm,20-30min B.30-50cm,30-60min C.50-60cm,20-30min D.50-60cm,30-60min
A.床单上垫橡胶单 B.保持合适的温度 C.掌握无菌技术 D.及时更换敷料