2. 外语
  3. Pig iron, wrought iron, and steel contain iron carbides made up of ______ of carbon.

Pig iron, wrought iron, and steel contain iron carbides made up of ______ of carbon.

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问题 Pig iron, wrought iron, and steel contain iron carbides made up of ______ of carbon.
选项 A、amounts are different
B、different amounts that
C、different amounts
D、which amounts are different
答案C
解析
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