To provide accurate reading of head pressure , the line should connect at the base of the water column.

为了提供精确的水头压力参数，管线应该连接到水柱的底部。

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Eg: the base of the column is quite firm.

这柱子的基础是牢固的。

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Eg: the base of the column is quite firm.

这柱子的基础是牢固的。

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