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???????2018-03-23

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??????????300???1000????????????????????????????????????????????????????????????

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2?????????????????壬??????????????????????????????????????????????????Щ????????1000????????????????300????????????????Щ??

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1???????????????????????壬?????????????????????

2???????????磨25.4mmX25.4mm????????????????????????????????????С???????????У???ν???????2.54?????1??磩?????е?????????????????????????????????????С???λ????????????????С??????С?????????????60????40??????С???????80???????????????

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