腹直肌肌皮瓣分两种,可设计为__________和__________。
参考答案:脐旁腹直肌肌皮瓣;下腹壁腹直肌肌皮瓣
________ the global economy is showing signs of recovery, many developing countries are still suffering.
A.As
B.Where
C.How
D.While
判断液体流动状态的依据是()。
A.雷诺数
B.莫迪图
C.尼古拉兹图
D.勃拉休斯公式