正常二尖瓣口面积为

• A.＜1.5 cm<img src="http://timg.fentiku.com/258/2018/12/19/G1NMoZ0sXb.png" title='G1NMoZ0sXb.png' alt='G1NMoZ0sXb.png'/>
• B.＜2cm<img src="http://timg.fentiku.com/258/2018/12/19/upvMC0AYBt.png" title='upvMC0AYBt.png' alt='upvMC0AYBt.png'/>
• C.2～3cm<img src="http://timg.fentiku.com/258/2018/12/19/wg4psjLOYo.png" title='wg4psjLOYo.png' alt='wg4psjLOYo.png'/>
• D.3～4cm<img src="http://timg.fentiku.com/258/2018/12/19/MGw8vYVlD8.png" title='MGw8vYVlD8.png' alt='MGw8vYVlD8.png'/>
• E.4～6 cm<img src="http://timg.fentiku.com/258/2018/12/19/x8HBzdlAev.png" title='x8HBzdlAev.png' alt='x8HBzdlAev.png'/>

正确答案：E