引起左心室前负荷增加的疾病是（）。
A.二尖瓣狭窄
B.贫血性心脏病
C.二尖瓣及主动脉瓣关闭不全
D.体循环动脉高压
E.主动脉瓣狭窄
参考答案：C
想象是指？
A: What are you talking about?
B: About to use search engines. [ ]
A. where
B. how
C. which
D. what
