扩张型心肌病病理改变的特点是:()。
A.心腔扩大
B.心肌纤维变性
C.有附壁血栓
D.心肌肥大,室壁多变厚
E.心内膜增生伴纤维化
参考答案:A, B, C
A Frenchman who lost his arms and legs successfully swam across the Channel, a challenge he for two years.
A.has been preparing
B.had been preparing
C.has prepared
D.prepares
对于3Fe(s)+4H2O(g)Fe3O4(s)+4H2(g),反应的化学平衡常数的表达式为( )