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[单选题]3.3  "To substitute roller or ball bearings instead of the earlier type of bearings" can be best explained as____.(1分)
  • Ato use roller or ball bearings instead of the earlier type of bearing
  • Bto use the earlier type of bearing instead of roller or ball bearings
  • Cto use both roller or ball bearings and earlier type of bearing together
  • Dto use none of them
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