()表面层由于塑性变形的结果其强度和硬度提高,塑性和韧性降低,从而在工件表面形成一定深度的硬化层的现象。
参考答案:表面强化
在常见的效果器面板上,()表示参数键。
A、CHOMS
B、HAM
C、PARAM
D、CAROM
Only one-fifth of Americans saw oil as the chief mason that the U.S. made a war on Iraq, but 75 percent of the French and of the Russians believed ______.
A. to B. so C. go D. do