In land surveying, what are perpendicular offsets?
Answers:
roundabouts
They are items you must be aware of when land surveying. But you know that, don't you?
http://www.glossary.oilfield.slb.com/dis.
The quake alarm designed by me will give warning before land slides.
The answers post by the user, for information only, UKQnA.com does not guarantee the right.