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因为新技
a. 矿工人数不变,矿产总量翻倍。 (可以从题干推出)
b. 矿产总量升高,是因为人均量升高了 (还有可能是人数增多)
c.如果有新开的矿,则人均量要大于平均的人均量 (因为生产技术和效率不变,所以不应该有这样的结果)
d. 人均量不变,则总量会不变或下降 (如果人数增多则未必)
e. 生产的单价降低,与题干完全无关。
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