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J1
anim.husb. 近交第一代 (first generation of inbreeding)
J₁
genet. 近交第一代
 English thesaurus
J1
abbr., earth.sc. Lower Jurassic (Lias)
abbr., oil lower Jurassic
J-1
abbr., mil. manpower and personnel directorate of a joint staff; manpower and personnel staff section