以下哪项是目前糖尿病病人死亡的主要原因()
A.酮症酸中毒
B.糖尿病肾病尿毒症
C.心脑血管病变
D.高渗性非酮症糖尿病昏迷
E.并发重度感染
参考答案:C
___ we are having today!
A.What pleasant weather
B.What a pleasant weather
C.What pleasant whether
D.What a pleasant whether
求方程y″-4y′+4y=0的通解.