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The length, diameter and using time of mandril are needed in the process of manufacturing the pipe.
在扩管生产中，需要实时了解每根顶杆的长度、外径、使用次数等信息。
You should also install the check valve as far from the pump as possible and at a minimum length of 5 times the pipe diameter.
止回阀应该安装在离泵尽可能远，或至少5倍管道直径的的位置。
In the case of constant pipe diameter, lengthening the length of vacuum tube is an effective way to increase the total heat of solar water heater!
在管径恒定的情况下，加长真空管的长度是增加太阳能热水器总得热量的有效途径和方向！
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