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矿床表生变化
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iron hat
铁帽
在矿体表部,由化学风化作用产生的,成分以水赤铁矿、针铁矿、褐铁矿为主的堆积体。
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Essential Account on Calligraphy
essential amino acid
essential amino acid index
essential boundary condition
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essential elements of agrometeorology
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