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A kind of parabolic cylinder three combines the device of cumulative pressure break increase shale gas recovery ratio
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A kind of paraboloid of revolution three combines the device of cumulative pressure break increase shale gas recovery ratio
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A kind of cleaning method of photovoltaic plant
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A kind of arc surface three combines the device of cumulative pressure break increase shale gas recovery ratio
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A kind of multistage Low Temperature Plasma Treating method of oil-field thick-oil recovered water
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A kind of mobile phone peripheral device with line holographic projections function
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A kind of quadrotor of brain wave control
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A kind of reading intelligent agriculture monitoring system
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