法洛四联症中最严重的畸形是( )A．肺动脉狭窄 B．室间隔缺损_爱下问搜题

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问题单项选择题

法洛四联症中最严重的畸形是( )

A．肺动脉狭窄

B．室间隔缺损

C．主动脉骑跨

D．右心室肥厚

答案

参考答案：A

选择题

I suppose by the time I come back in ten years' time all these old houses_______down.

A．will be pulling

B．will have been pulled

C．will have pulled

D．will be pulled

问答题简答题

简述芹菜育苗技术和采收技术。