The nurse is caring for a client who undergoes a total right knee replacement. The nurse would anticipate which of the following activity orders for this client on the first postoperative day

A. Bed rest for 24 to 48 hours after surgery.
B. Ambulate with walker twice a day.
C. Up to chair with leg elevated.
D. Dangle at bedside for 20 minutes.

封头胎膜拉环高度H=h+（），其中h为下胎拉环总高度。

A.60~100mm

B.100~150mm

C.150~200mm

D.200~400mm