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steel
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碳含量一般在2.0%以下并含有合金元素的可进行塑性变形加工的铁碳合金。
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steel
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Petroleum Field Size Sequence Method
petroleum gas
petroleum geochemistry
petroleum geology
Petroleum Geology & Experiment
petroleum hydrocarbon
petroleum hydrocarbon alkylation
petroleum hydrocarbon degrading microorganisms of soil
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petroleum paraffin
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Petroleum Planning & Engineering
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