He is very tired after walking too long, so he wants to stop  _____ a rest.

[      ]

A. having

B. had

C. has

D. to have

下列不是产品设计与制造工艺设计的结合（DFM）主要方法工具的是（）

A、DFM基本原则

B、决策分析

C、装配设计（DFA.

D、缺陷树分析（FTA.