初产妇，24岁，足月，规律宫缩4h后检查：宫口开全，先露S+3，胎心率154次／分，哪项诊断正确（）。

A.原发性子宫收缩乏力

B.滞产

C.胎儿窘迫

D.正常产程

E.加速期延缓

The nurse is developing a teaching plan for a client diagnosed with osteoarthritis. To minimize injury to the osteoarthritic client, the nurse should instruct the client to （）.

A．install safety devices in his home.

B．wear comfortable shoes.

C．get help when lifting objects.

D．wear protective devices when exercising.