试题与答案

正常成年人,二尖瓣口面积为4~5cm2,血流在舒张期和右心房通过二尖瓣的口流入左心室

题型:单项选择题

题目:

正常成年人,二尖瓣口面积为4~5cm2,血流在舒张期和右心房通过二尖瓣的口流入左心室,当风湿性二尖瓣狭窄病变时,在何种病理情况下最可能产生急性肺水肿

A.瓣口面积<4cm2
B.瓣口面积<3cm2
C.瓣口面积<2cm2
D.瓣口面积<1.5cm2
E.瓣口面积缩小到1cm2以下时

答案:

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参考答案:对解析: 单位在确定坏账准备的计提比例时,应当根据以往的经验、债务单位的实际财务状况和现金流量等相关信息予以合理估计。除有确凿证据表明该项应收款项不能够收回或收回的可能性不大外(如债务单位...

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