正常心脏左室射血分数（EF）值应为（） A.EF>40％ B.EF>60％ C.EF

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问题单项选择题

正常心脏左室射血分数（EF）值应为（）

A.EF>40％

B.EF>60％

C.EF>70％

D.EF>80％

E.EF>50％

答案

参考答案：E

选择题

— That boy enjoys drawing very much.

—____, I have never seen anyone else who is as enthusiastic about drawing as he is.

A．As long as I have traveled

B．Traveled so much as I have

C．As I have traveled so much

D．Much as I have traveled

多项选择题

典型的IPv6节点上的接口具有哪些单播地址（）

A、每个接口的链路本地地址

B、每个接口的附加单播地址

C、环回接口的环回地址

D、兼容IPv4地址

E、IPv6隧道地址