题目内容
（请给出正确答案）
[单选题]
The thickness ratio of the ferrite and cementite layers in pearlite is approximately （).
A.8 to 1
B.6 to 1
C.5 to 1
D.4 to 1
提问人：网友rocketsa
发布时间：2022-01-07
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A、presentation
B、interests
C、profitability
D、investment
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