从所给的四个选项中，选择最合适的一个填入问号处，使之呈现一定的规律性（）
A.选项A
B.选项B
C.选项C
D.选项D
参考答案：C
在三投影面体系中，铅垂面（）于水平投影面、（）于正立投影面、（）于侧立投影面。
A child with rheumatic fever complains of painful joints. What nonpharmacologic measures should the nurse use to reduce the child's pain ？（）
A．Performing gentle passive range-of-motion (ROM) exercises.
B．Gently massaging the painful joints.
C．Using a bed cradle to keep linens off the joints.
D．Encouraging position changes in bed every 2 hours.
