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陌生人晕倒了，帮他拨打120后，病人不支付120出车费，这个费用谁来承担？

草龟为啥那么容易死啊？

为什么民众更关注华为对5nm芯片的突破，而不是关注小米已经自研的3nm芯片？

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这个水闸怎么拧开？

发布时间：2025-06-27 19:40:11点击量：

这种一般是闸阀。

开关方向是 顺时针关闭，逆时针开启的。

不要搞反了、这种阀芯的升降螺纹在阀体内，暗杆形式，与介质接触。

螺纹时间长容易锈蚀，或者沾染泥沙。

转不动。

如果纯铜的或不锈钢的还好，铸铁的时间长了就拧不动了。

只能整体更换，或者拆开上阀盖清洗。

。

这个水闸怎么拧开？

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