section a-a a-a

reduction of emission of extraction tail gas

remote sensing of source emission

A level of first order

average voice level of a grade in surface

high level of a pulse

level of a factor

level of a test

level of a time varying quantity

low level of a pulse

the model of level of detail

The Order of a Level Set

a source of danger

A source of harmonic

at a distance of

discrete method of source of magnetic field

equivalent activity of a source

hot pump of source of water

identification of disturbance source