A:S△BEC=2S△CEF
B:EF=CF
C:∠DCF= 12 ∠BCD
D:∠DFE=3∠AEF
已知等比数列an中,a2=12,a3=14,ak=164,则k=( )
菊花的繁殖方式是( )。(多选)
find, that, key, she, picture