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Research on The Number of Balls in The Spherical Universal Joint
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The rubbing pair friction experiments of steel ball and acetabulums of different materials and structures are conducted in the artificial hip joint test machine, and the results of friction experiments of different acetabulum balls and sockets under the same experimental conditions are compared and analyzed.
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Solder joint reliability is highly dependent on solder ball height uniformity/ coplanarity, so it is very important to measure the height of solder balls on chips.
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