患者，女性，49岁，风湿性心脏瓣膜病二尖瓣狭窄近30年，最近一次超声心动图诊断其二尖瓣狭窄程度为重度狭窄，则其 二尖瓣瓣口面积符合
A 4～6cm<img border="0" alt="" src="https://img.weimei168.com/uploads/upimg/20221202/13384529_0.gif"> B
2～4cm<img border="0" alt="" src="https://img.weimei168.com/uploads/upimg/20221202/13384529_0_1.gif"> C
<2cm<img border="0" alt="" src="https://img.weimei168.com/uploads/upimg/20221202/13384529_0_2.gif"> D
<1.5cm<img border="0" alt="" src="https://img.weimei168.com/uploads/upimg/20221202/13384529_0_3.gif"> E
<1．0cm<img border="0" alt="" src="https://img.weimei168.com/uploads/upimg/20221202/13384529_0_4.gif">
