4 min 30 SEC Operators observe that the water level in the primary system is rising and that the pressure is decreasing.

4分30秒操作员观察到主回路的水位在上升且压力在下降。

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Objective To set up a method for the primary isolation and cultivation of rat sinusoidal endothelial cells (SEC), and study their biological characteristics.

目的建立大鼠肝窦内皮细胞(sec)的原代分离、培养方法，并研究其生物学特性。

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Primary requirements of SEC criteria, such as technical operability of reserve, economic condition, and time property were summarized.

总结了SEC标准的基本要求，即储量的技术可操作性、经济条件和时间属性。

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