Science Project story. Keep the tennis ball machine is intended to keep the tennis ball machine and fabrication, to test the performance of the machine, keep the tennis ball. Keep the tennis ball machines are used to drive the motor, propeller rotation to keep the tennis ball. To find the performance of the machine, keep the tennis ball machine, keep the tennis ball and collect tennis balls. 100 ball putting on and timer I found that a store can keep the tennis ball tennis ball faster than the average collector 2.17 minutes and assess customer satisfaction tools and collect tennis balls, it was found that the process of implementation, and how the overall shape is good.
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