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What was the first instrument to ever record an earthquake?
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The sound level near a noisy air conditioner is 70 db. if two such units operate side by side, the sound level near the, would bea. 70dbb. 73 dbc. 105 dbd 140 db
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What structural formula represents 4 electrons shared between two atoms?
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What is the difference between a parallelogram and a trapezoid angles...
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