As the economy perked up steel mills bought ore first on the spot market and later from the big three at a "provisional price" that exceeded what CISA was demanding.
随着经济的回暖，钢厂们不顾中钢协的规定，起先是在现货市场采购矿石，之后以临时价向三大巨头进行直接采购。
The merit-order-based method is used to solve the spot balancing trading model, which not only ensures economy and security, but also makes power market fair and transparent.
使用最优次序法求解此模型，不仅满足了经济性与安全性的要求，而且满足了电力市场的公开和透明要求。
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