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["【Задание на день №55】с", "Эта ветка последней раз редактировалсяся��莲花 в 2--2-21 16: [Задание на день №55]с22-年22月1日 Вавовые клапаны обычно используются при больших разностях давлений, больших расходах и при содержании подвижных частиículas."

2019-02-20View Original

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本帖最后由 绿莲花 于 2019-2-21 16:32 编辑 【每日一题 第51题】2019年2月20日 蝶阀一般用于大压降,大流量和含悬浮粒的场合。 判断题() 请在两日内作答。

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