angellove127 发表于 2014-9-9 17:16
正确选项是在比较 the cost of running plant A 和 the cost for plant B= the cost of running plant B
...
angellove127 发表于 2014-9-9 17:16
正确选项是在比较 the cost of running plant A 和 the cost for plant B= the cost of running plant B
...
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