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Mechanices: normal atmospheric pressure, students will see that the coin falls at a faster rate than the feather because of air resistance. When air in the tube is pumped out via a vacuum pump to create a vacuum ...

Measuring Tools for General Science in Middle Schools: normal operation in the -10℃ to +40℃ temperature range. Carry bag and neck strap are included. No battery required. Download Mechanical Stopwatch Timer for Timekeeping in Sports and Competitions ...

Engine Section Demo Model for Vocational Schools Polytechnic Colleges and Maintenance Training: by motor, to make sectioned model can operate normally, demonstrate crank, cam axle rotation, piston work; gas valve opens and closes, for timed gas distribution and ignition. 3. The different ...

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