金属材料的力学性能有几种?
参考答案：
有弹性、塑性、强度、硬度、冲击韧度和疲劳强度等六种。
Although he is wise and intelligent, he fails to be elected as the manager. After all, ________ men can
be masters.[ ]
A. not every
B. each
C. all
D. not all
2小时12分=______时；4.2吨=______吨______千克．
