It's shorthand for above sea level. A term generally used to define how the top on Earth is to a certain position.
00:46, 15 January 2013
A sharp end object has an edge that can cut or and end that ...
Beijing Capital International Airport is the main ...
A movable horizontal airfoil, usually attached to the ...
A flight condition wherein the airflow separates from the ...
A sonic boom is the loud sound created by the shock waves ...
A highly maneuverable fighter plane used during World War I ...
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