诊断风湿性心脏病二尖瓣严重损害，最重要的X线征象是（）。 A._爱下问搜题

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问题单项选择题

诊断风湿性心脏病二尖瓣严重损害，最重要的X线征象是（）。

A.肺循环高压

B.左心房重度增大

C.二尖瓣区钙化

D.右心房重度增大

E.重度间质性肺水肿

答案

参考答案：C

选择题

— How old is the bridge over there?

— Oh, it's very old. It _____ about eight hundred years ago. [ ]

A. has built

B. is built

C. was building

D. was built

问答题简答题

用化学方法鉴别肾上腺素、盐酸异丙肾上腺素和重酒石酸间羟胺。