31.下列何者屬於出生後的secondary lymphoid organ?①bone marrow ②lymph nodes
③spleen ④thymus
(A)①③
(B)②④
(C)①④
(D)②③
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統計: A(150), B(281), C(225), D(1382), E(0) #1150965
統計: A(150), B(281), C(225), D(1382), E(0) #1150965