The stage where the volume pumped places the influx inside the casing shoe (the shoe line), is important as well but has not been included in these basic phases in well control.

泵入体积将侵入挤入管鞋内这一阶段是个十分重要的阶段，但不包括在井控的这几个基本阶段。

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Observed items are groundwater level, oil recovery volume, casing pressure and gas recovery volume.

观测项目有水位、采液量、采气量及套管压力等。

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SF (b) series adopt special twisted blade design and flange flanging casing, which makes the noise lower and the air volume larger.

本系列风机的叶片采用特殊扭曲孤度设计，机壳采用法兰翻边工艺，使风机噪音更低，风量更大等特点。

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Buttons set into the elegant metal casing allow you to adjust the volume, select music titles, take phone calls and activate voice control or personal assistant features.

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Eliminating the volume control component from the inside of the casing reduces the noise in the circuit, allowing the music to be heard more clearly.

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There is also a display, just you don't see it until you nudge the volume up, or change the audio source etc, as it's set behind the casing.

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