abbr. Propulsion Auxiliary Control Box 
辅助操纵箱
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butyraldehyde, butyramide, butyranilide, butyrase, butyrate, Butyribacterium, butyric, butyric acid, butyrin, butyrinase,
相似单词
pack-thread, packtrain, packwork, PACM, Paco, PACOB, pacoidoscope, PACS, pact, pactamycin,