The meteorological and hydrological data in the Songhuajiang and Nenjiang area were used to discuss the effect of precipitation on the change of the water level.

利用松花江、嫩江流域的气象和水文资料，讨论了该流域降水对水位变化的影响。

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The traditional control mode of three-variable in the drum water level mostly use PID, the effect of it can be improved.

传统的锅炉水位三冲量控制系统大都采用PID控制，其控制效果还可以进一步提高。

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This paper makes an analysis on the causes of coupling effect in a two-sectional drum water level control system.

本文根据两段式水位调节系统的特点，分析了耦合作用产生的原因。

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The level of concentration in water had a "negligible effect" on people's uptake of the fluoride ion - responsible for increased risk of fractures, they said.

BBC: Fluoride 'does not cause fractures'