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第1题

The maipractical advantage of lower pairs is their better ability to trap lubricant betweetheir ______ surfaces.
· en
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第2题

Before two components are assembled together, the relationship betweethe dimensions of the mating surfaces_______.
·
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第3题

As a result, the system will vibrate at the frequency of the _____ force regardless of the initial conditions or natural
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第4题

The planer and knee types of milling machine is _____ because of its flexibility.
· used most commonly
· most popu
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