问题
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The findings of James and other scientists in thei
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Friction developing between the moving parts of a governor, governor linkage and control v
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The amount of fluid friction or internal friction inherent in a mineral lubricating oil is
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The countries have made a trade agreement that will greatly () the development of thei
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_________(53)A.behind B.between C.among D.without
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(The workers) in the factory (demanded) that thei
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