这种微观几何形状的尺寸特征，一般是由零件的加工过程和其他因素形成。

The microscopic size and shape characteristic made by the process and other factors.

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将D（s）等于零可以得到特征方程。

The characteristic equation is formed by setting D(s) equal zero.

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目的：制备具零级释药特征的丹皮酚缓释片。

Objective: To prepare Paeonol Sustained-release Tablets of zero order release.

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因此，所有的特征值为零或正。

Hence, all eigenvalues are zero or positive.

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因此，所有的特征值为零或正。

Hence, all eigenvalues are zero or positive.

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