A level line is based on altitude. Altitude is the distance from
sea level. Sea level is curved to the shape of the earth so a level
line must be curved.
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Mic level is -56 to -40 dbm. Line level is either -10 dbm or 4
dbm. You need a preamp to amplify a microphone to line level.
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Interpreater translate the high level language into machine
level language line by line