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Figure 2 shows the structure of the SQL model at the schema level.
图2显示了SQL模型的模式结构。
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A math model of the sub structure level is built to calculate the work cycle.
为设计计算工作循环，建立了该模型结构子层的数学模型。
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A math model of the sub structure level is built to calculate the work cycle.
为设计计算工作循环，建立了该模型结构子层的数学模型。
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