正极材料直接影响锂电池的能量密度和性能，其占锂离子电池成本的20%--30% 30%--40%40%--50%50%--60%

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国家开放大学 / 新能源汽车技术

正确率：100%

正极材料直接影响锂电池的能量密度和性能，其占锂离子电池成本的
20%--30%

30%--40%

40%--50%

50%--60%

积分

新能源汽车技术

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设A={∅}，B=ρ(ρ(A))，问下列各题正确的是（）。离散数学

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