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举一反三
【单选题】听力原文：(A)They're setting the table for a meal. (B) They're concentrating on some documents. (C) They're taking off their glasses. (D)They're taking their seats for a meeting.
A.
B.
C.
【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】过共晶白口铸铁碳的质量分数为
【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.
A.
B.
C.
【简答题】亚共晶白口铸铁碳的质量分数为 ，其室温组织为 。
【单选题】听力原文：(A) They're signing some forms. (B) They're standing next to the sign. (C) They're putting up signs. (D) A man is pointing into the distance.
A.
B.
C.
D.
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