单侧鼻唇沟皮瓣,可以修复上唇组织缺损达()
A.1/3
B.1/2
C.1/4
D.3/4
E.2/3
参考答案:B
下列反应的离子方程式书写正确的是( )
A.氯气和水的反应:Cl2+H2O═2H++Clˉ+ClOˉ
B.向氯化铝溶液中加入足量氨水:Al3++4NH3•H2O═AlO2-+2H2O+4NH4+
C.用FeCl3溶液腐蚀印刷电路板:Fe3++Cu═Fe2++Cu2+
D.惰性电极电解饱和氯化钠溶液:2Clˉ+2H2O通电.Cl2↑+H2↑+2OHˉ
Though buried in the ruins for about 70 hours after the earthquake, with great luck, the man managed to______.
A.recover
B.exist
C.survive
D.rescue