【简答题】共晶白口铸铁碳的质量分数为____,其室温组织为____;亚共晶自口铸铁碳的质量分数为____,其室温组织为____;过共晶白口铸铁碳的质量分数为____,其室温组织为____。
【简答题】过共晶白口铸铁碳的质量分数为 ,其室温组织为 。
【简答题】听力原文:(A) They're shaking hands. (B) They're moving some chairs. (C) They're playing a . (D) They're posting something on the board.
【单选题】听力原文:(A) They're standing in a line. (B) They're studying a map. (C) They're buying some magazines. (D) They're looking at the same book.
【简答题】亚共晶白口铸铁碳的质量分数为 ,其室温组织为 。
【简答题】共晶白口铸铁碳的质量分数为______,其室温组织为______;亚共晶白口铸铁碳的质量分数为______,其室温组织为______;过共品白口铸铁碳的质量分数为______,其室温组织为______。