Drainage Tank Section structure detail

<p>Drainage Tank Section structure detail,&nbsp;Including position, using a collection for a friend, - Clicking on the drawing on the school record, in mm, - Accumulating AI-CT3 (= &lt;$ 10) and AII (&gt; = $ 12), - Position position, use a collection to match, - Click on the account from the previous record, - Click on the account from the record to calculate the mm.&nbsp;The first part is 4x6m100 etc.</p>