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Strong anti-pollution composite gradient ultrafiltration membrane and preparation method thereof
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Cast aluminum alloy for high-power-density piston and preparation method thereof
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Purine nucleoside phosphorylase mutant, gene and application
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L tea making machine
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Anti-abrasion gear and matched cleaning device
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Fault tolerant reversing valve
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Valve plate of multi-way valve
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Fault-tolerant hydraulic valve
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Fault-tolerant vibrator
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Multi-way valve
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Civil engineering experiment evaluation control system and method
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