影响奥氏体晶粒长大的因素有哪些
参考答案:影响奥氏体晶粒长大的因素有: (1)加热温度; (2)保温时间; (3)钢中含碳量; (4)钢中合金元素种类。
When crossing a front,isobars tend to().
A.change from smooth curves within the air mass to sharp bends at the front
B.change from sharp bends within the air mass to smooth curves at the front
C.pass smoothly across the front with no change
D.become closer together at the front and pass through in straight lines
()不属于工商行政管理控制职能的内容。
A.控制市场经营主体的市场进入
B.控制市场结构
C.控制程序必须合理化和科学化
D.控制市场行为