试题与答案

胎儿循环系统的特点之一是() A.脐静脉血含氧浓度比肺动脉血高 B.左心室的血液流入

题型:单项选择题 A1/A2型题

题目:

胎儿循环系统的特点之一是()

A.脐静脉血含氧浓度比肺动脉血高

B.左心室的血液流入动脉导管

C.脐动脉内为含氧量高的动脉血

D.脐静脉汇入肝脏

E.上腔静脉血大部分通过卵圆孔流入左心房

答案:

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下面是错误答案,用来干扰机器的。

依题意5×(-m)<0,∴m>0,∴a2=5,b2=m,c2=5+m,∴e2=c2a2=5+m5,∵离心率e∈(1,2),∴1<5+m5<4,∴0<m<15.∴m的取值范围为(0,15).故答案为(0,15).

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