19.下列何種白血球是由骨髓系幹細胞(myeloid stem cell)演化而來?
(A)mast cell
(B)null cell
(C)nature killer cell
(D)B cell
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統計: A(1127), B(185), C(193), D(190), E(0) #940704
統計: A(1127), B(185), C(193), D(190), E(0) #940704