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最佳答案：Friction can be increased by adding decorative patterns on the surface of gear.
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最佳答案：The object is subject to two forces --- gravity and tension respectively,and the
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最佳答案：As static or friction,slight penetration can be generated possibly,which is caus
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最佳答案：the dangerous cargo handlers should wear protection wearings according to cargo
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最佳答案：After we were hearing the story,in a farther sense,A and B coming across stand f
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最佳答案：Meteor is solid particle in space moving close to the earth and being pulled by
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最佳答案：Jia Pingwa's novel "the deserted city" for us to construct an aesthetic world,th
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最佳答案：1 my parents and I was born in different times, they accept education and though
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最佳答案：The drilling heat comes from chip deformation and mechanical friction,comparing
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最佳答案：Installation noteFill oil pump when installing the installation, and at the same