... turning slide valve 转动滑阀 turning device valve 回转设备阀门 exh turning valve tapper complete 排气阀转阀机构装置总成 ...
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Said diameter plate composed of two pieces is installed in the slot on inner side of compasses' disk. The slide valve and turning handle are on the diameter plate for drawing circle precisely.
圆规盘内侧壁设计了直径片转动槽，直径片分两片组装进入转动槽，直径片上设计有滑动阀与转动柄，从而达到精确划圆的目的。
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