valve reversal
... 阀钢:valve steel 阀倒转:valve reversal 发生炉燃气,瓦斯:generator gas ...
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安装到瓶帽孔顶部的阀的特征在于:它具有小通风帽(3),该帽容 纳倒转的柔性容器(4)。
A valve attached to the top of the cap port is characterised in that it has a small ventilated cap (3) housing an upside-down flexible vessel (4).
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