Therefore it is important to make a spot portfolio which can trace the index.
套利策略中期现套利的关键是构建目标指数的现货组合。
The diameter and quantity of the spot were coincided with the field disease index.
病斑直径和数量变化与田间病情动态基本一致。
The diameter and quantity of the spot were coincided with the field disease index.
病斑直径和数量变化与田间病情动态基本一致。
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