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 exercisin

以下关于工艺尺寸链说法正确的是（）

A、由同一个零件上与工艺相关的尺寸所形成的尺寸链称为工艺尺寸链

B、直线尺寸链用于工艺基准和设计基准不重合时工艺尺寸的计算

C、直线尺寸链用于定位基准和设计基准不重合时工艺尺寸的计算

D、直线尺寸链计算过程中不涉及圆