The nurse is caring for a client who recently underwent a total hip replacement. The nurse should（）

A. ease the client onto a low toilet seat.

B. allow the client’s legs to be crossed at the knees when out of bed.

C. use soft chairs when the client is sitting out of bed.

D. limit client hip flexion when sitting.

为什么要通过试验确定冲压件毛坯尺寸？