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聚丁二烯丙烯酸共聚物推进剂
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航空航天词汇手册
polybutadiene acrylic acid copolymer propellant(PBAA propellant)
聚丁二烯丙烯酸共聚物推进剂
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background processing
background projection
background radiation
background radiation
background radiation
background radiation
background radiation monitoring
background ray
background reading
background reading
background response
background scene
background sound
background source
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background survey
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back guide bar (BGB)
back gun
backhand drainage
backhand welding
backhand welding
backhaul
back-haul
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