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【元素半导体材料】
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germanium
锗材料
化学元素符号Ge,位于元素周期表Ⅳ族,原子序数32,原子量72.60,银灰色脆性金属,有光泽。是一种重要的半导体材料。
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residual assignment principle
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separating infrastructure management from transport operation
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