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最佳答案：Hydraulic technology is widely applied in machinofacture、 metallurgy、aviation、li
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最佳答案：Tractors in the upgrade is essential devices, the hydraulic system through the c
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最佳答案：This machine applys to shape suppressing of all kinds of power material (includi
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最佳答案：Modern automobile (vehicle) engineering control techniques is moving towards the
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最佳答案：This topic in welds in robot's foundation,the work table welding special plane h