测量小儿血压时的袖带宽度应为()
A．上臂长度的4／5
B．上臂长度的2／3
C．上臂长度的1／2
D．上臂长度的1／3
E．上臂长度的1／4
参考答案：B
It is a paradox（自相矛盾） that in a rich country there should be many poor people.
A．such; such
B．such; so
C．so; so
D．so; such
（）is a property of object-oriented software by which an abstract operation may be performed in different ways in different classes.
A.Method
B.Polymorphism
C.Inheritance
D.Encapsulation
