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Question:

What is light steel keel arch? Under what circumstances need to be arch?

What is light steel keel arch? Under what circumstances need to be arch?

Answer:

We often take measures in the middle to lift it up a little, so that it is affected by the heavy sag of gravity, which is the legendary arch.
Light steel keel if too long, then the middle will sag, just like you pull a straight line, pull straight again, it will also be sagging in the middle

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