This system includes 46 indexes in 4 layers: goal layer, criterion layer, fieldlayer, and index layer.
该指标体系设立目标层、准则层、领域层和指标层4个层次的指标,共有46个指标。
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They are transient tangles in the sun’s magnetic field that are slightly cooler than their surroundings and so appear as dark patches in the photosphere—the surface layer of the sun.
They are transient tangles in the sun's magnetic field that are slightly cooler than their surroundings and so appear as dark patches in the photosphere—the surface layer of the sun.