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波纹管补偿器怎么画啊,画出来以后 要有一定的伸缩量,用钣金行吗? |
小黑屋|手机版|Archiver|机械社区 ( 京ICP备10217105号-1,京ICP证050210号,浙公网安备33038202004372号 )
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