设讦轴心受力构件时，轴心受压构件只需进行强度和刚度计算。
参考答案：错
Frank's mother told him _____ too much sugar because it is bad for his teeth.[ ]
A. to eat
B. not to eat
C. eat
（）主要用于制造低速，手动工具及常温下使用的工具、模具、量具。
A.硬质合金
B.高速钢
C.合金工具钢
D.碳素工具钢
