左侧三房心的超声所见,哪一项错误()
A.左房内有一隔膜
B.左房内隔膜上有孔
C.肺静脉血只回流到真性左房
D.左房内隔膜及合并房缺
E.肺静脉血全部回流到副房
参考答案:E
The ___ on the blackboard reads: Everyone should be present at the meeting.
A.record
B.word
C.notice
D.warning
点A(a2-1,七a)在x轴上,则A点的坐标为______.