零件图技术要求不包括（）。
A、零件各个表面的粗糙度
B、零件形状的加工精度
C、材质及热处理及其要求
D、图纸编号
参考答案：D
The retired man donated (捐赠) most of his savings to the school damaged by the earthquake in
Yushu, ______ the students to return to their classrooms. [ ]
A. enabling
B. having enabled
C. to enable
D. to have enabled
怎样配置攀缘植物
