... 瓷石 china stone; porcelain stone 瓷室 porcelain chamber 瓷首饰 porcelain jewellery ...
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There was no damage found inside, but there was a little of metal powder in the arc chamber and porcelain bushing and some of the powder has been burned.
阐述了返厂解体检查的情况，内部未发现损伤，但灭弧室和瓷套内有微量金属粉末，部分有灼痕。
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