... 噪声-空气污染：noise-air pollution 噪声截止：noise cutting off 噪声降低系数：noise reduction coefficient ...
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Problems of falling chip, tool tipping and big noise are happened during cutting off main bearing caps made of gray casting by using combination milling cutters.
采用组合铣刀切断灰口铸铁材质的汽车发动机主轴承盖时，出现工件掉渣、刀具崩刃、噪声大等问题。
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