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person:("yang, dong")
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person:("yang, jing")
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person:("yang, ming")
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person:("yang, ying")
Leveling supporting leg foot structure with sole timber
Flat plate type frame structure of integrated rotary table
Underwater launching platform based on carbon dioxide liquid-gas phase change
Parallel four-rod thin frog leg mechanism and use method
Cartridge clip type flame bomb launching device convenient to assemble and disassemble