肥厚型梗阻性心肌病的主要病理特征是()
A.二尖瓣收缩期前向运动
B.主动脉下部室间隔明显增厚
C.不均等的室间隔增厚
D.室壁心肌普遍增生肥厚
E.心肌弥漫性结缔组织增生
参考答案:C
The government ______the diplomatic note from Japan for its unclear attitude to the trade between two countries.
A.denied
B.refused
C.rejected
D.objected
既有离子键,又有共价键的化合物是
A.CO2
B.MgCl2
C.Na2O2
D.NaOH