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    ???۸˵ij????ȳ???4:1ʱ???????۸˾ͻᷢ?????񡣼??ӹ???ֱ??Ϊ1*(25.4mm)ʱ??????۸˴ӻ??????????쳤?ȳ???4*??101.6mm??,?ͻ?????????????????????

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    Ҫ???????????ۿײ???????????򵥵ķ????Dz???ֱ????????۸ˡ????ǣ?????ֱ????????۸˲??????ǿ?ȥ?ķ???????ʱ?б?Ҫѡ??????????????ʱͨ???򵥵????????ٶ????ı??????????Ϳ??Խ?????⡣????????ٶȻ򽵵??????ٶȿ?????????????????????????Ҳ??????????????????ʱ??Ҫ???????е????????????????𶯡???Ϊ?۸?ϵͣ??????۸˵?Ӧ?????ձ顣?۸?Ҳ???Բ??????????ϡ????磺???????????ѿ??????ؽ????۸˺?Ӳ?ʺϽ??۸????ڼ????ؽ????۸????ܶȱ???ͨ?ָߵ??ٺϽ???ɡ??????ؽ????۸˱ȸ????۸˼۸?ߣ????????õij????ȸ??󡣸????۸˵Ŀ??ó?????һ?㲻????4;1,???ؽ????۸˵Ŀ??ó????ȿ?????6:1.????????????ٶȺͽ????ٶȣ??ؽ????۸˵Ŀ??ó????Ȼ????Ը??ߡ?    ????????

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