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腕表的旋转外圈的首15分钟增设分钟刻度。

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JRU直压式气液增压器是油缸分离型气液增压缸，就是把JRE直压式气液增压缸的油缸分离出来，又叫做分体式气液增压缸，水平安装方式，没预压行程，只需要一个电磁阀控制，操作维护简便，动作速度快，可用于高频动作而且不会产生油雾。

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4）风机停车后检查轴承明显的不正常现象如螺栓松动。

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