平行四边形：长方形：正方形（）
A.点：线段：三角形
B.三角形：等腰三角形：等边三角形
C.线段：三角形：四边形
D.直线：平面：空间
参考答案：B
In planning a presentation that advocates a decrease in the client-to-nurse ratio from 8:1 to 6:1, a nurse should emphasize its effect on （）.
A．institutional resources.
B．standards of practice.
C．client-care quality.
D．nursing recruitment.
早产的常见原因有哪些？
