400-600-1123
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答案：
A
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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