珠光体转变成奥氏体的过程是碳的再分布及铁原子的自扩散,使之产生晶格重排,是属于扩散性相变。()
参考答案:对
You can find ________ become more difficult to see clean rivers in our city.
A.that has
B.it has
C.it
D.this has
彩色棉品种自身缺陷的是()