Test # 107
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1500 questions in 150 tests. Each test contains 10 questions.
Idiom of the Day
work out (for the best)
to end successfully, to prove effective or satisfactory
I hope that everything will work out for my friend when she moves to London next week.
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Precautions while using Centrifuge
Know your rotors and maintain a log book
Rotors (high speed and ultra) of unknown history may not be used. A complete and comprehensive rotor log is to be kept for every high speed and ultracentrifuge rotor, and will include all user names, run dates, durations, speeds, total rotor revolutions, and any notes on rotor condition.Rotor manufacture date, and the date of stress testing (magnaflux or other professionally recognized analysis) if applicable, shall be recorded and kept with the rotor log.