The role of compression springs bad gall on automatic control valve flow area of the size, so that a constant flow through the valve.

弹簧受压差的作用自动控制阀胆上过流面积的大小，从而使通过阀门的流量恒定。

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Based on the chromatographic detector theory, whether a chemical reaction is a fast reaction or not it can be judged according to the product of peak area and carrier flow rate is a constant or not.

本文运用色谱检测器理论，由峰面积与载流流速的乘积是否为一常数可判断某一化学反应是否为快速反应。

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Twice a week there is a constant flow of people - mostly women - with wheelbarrows full of refuse they have collected in the area.

BBC: Paying with 'kisses' as Brazil��s social currencies spread