完全可调整的开启角度 Fully adjustable opening angle
将阀门完全开启到它的记忆设置点上，在一张纸上，记录这个阀门设置。
Open valve fully to its memory setting and, on a piece of paper, record the valve setting.
完全开启排气针形阀直到从排气连接处的滴漏停止为止。
Open vent needle valve fully until dripping from vent connection stops.
如果有需要，内部玻璃层可完全开启，使整个空间南北向通风。
If needed, is also possible to totally open the inner glass layer to ventilate the whole space from south to north.
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