OK, so, we've seen that if we have a vector field defined in a simply connected region, and its curl is zero, then it's a gradient field, and the line integral is path independent.

一个向量场,如果定义在单连通区域并且旋度为零，那么它就是一个梯度场，并且其上的线积分与路径无关。

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For the exist of moisture content gradient and thermal gradient, the thickness swelling is larger than the line swelling and so the thickness swelling is the emphasis of study.

由于含水率梯度和温度梯度的存在，使得厚度膨胀远远高于线膨胀，因此厚度膨胀历来是尺寸稳定性的研究重点。

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The selection of moving phase, gradient eluting procedure and line relation of sampling concentration with peak height were discussed.

研究了流动相的选择，梯度淋洗程序的最佳化以及进样浓度与峰高的线性关系。

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