The deformative charateristics of cementite of white cast iron during the rolling process was investigated.研究了惨碳体在白口铸铁轧制变形过程中的变化特点.A mixture of ferrite cementite forming distinct layers or bands in slowly cooled carbon s...
We are going to see the new play at the Playhouse.我们要到大剧院看新剧.Next week we will play at a football game.下周我们将参加一场足球比赛.He's a very ambitious lad and he wants to play at the highest level.他是个很有抱负的小伙子，想参加最高水平的比赛。...