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【单选题】

When carbon is added to iron in proper______, the result is steel.

A、rates
B、thicknesses
C、proportions
D、densities
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根据网考网移动考试中心的统计,该试题:

2%的考友选择了A选项

22%的考友选择了B选项

59%的考友选择了C选项

17%的考友选择了D选项

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