回火稳定是由于合金元素改变碳化物形成温度,并且高温回火时形成的特殊碳化物延迟α相的回复和再结晶,因而使硬度、强度仍保持很高水平。()
参考答案:对
Tony, there are few mistakes in your homework,don’t make same mistake again.
A. a, a B. a., the C. the , the
胃溃疡的胃液酸度是()
A.升高
B.明显减少
C.明显升高
D.常减少
E.正常或减少