冲洗并放净管道系统，然后安装孔板。

Flush and drain system and install orifice plates.

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冻融循环试验表明，由于净浆、砂浆和混凝土这三种水泥基材料孔结构的不同，使得其破坏时的外观和断面形状各不相同。

Freezing and thawing test shows that the figuration and cross-section of cement-based materials (paste, mortar and concrete) are different after they damage because of their different pore structures.

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主要产层为低渗透超致密砂岩，其渗透率和孔喉结构对上覆地层净压力很敏感。

The major pay bed is low permeable ultra dense sandstone. Its permeability and pore throat texture are very sensitive to the net pressure of overlying strata.

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