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person:("zhang yongqi")
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person:("zhang hongqi")
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person:("zhang dongqi")
Horizontal ship body section stack correcting device and method
Steering bracket for outboard engine and using method of steering bracket
Ship traverse channel and manufacturing method thereof
Supporting column and supporting column manufacturing method
Ship superstructure and ship superstructure assembling method
Buoyancy fishing device based on underwater explosive searching and removing
Pontoon bridge leaking stoppage device based on diving technology
Rapid inflating and deflating device and system for automobile tire and automobile