8.骨單位(osteon)之中央管(central canal)含有:
(A)骨基質(bone matrix)
(B)血管與神經纖維(blood vessel and nerve fiber)
(C)紅骨髓(red marrow)
(D)黃骨髓(yellow marrow)
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統計: A(120), B(386), C(87), D(36), E(0) #1201039
統計: A(120), B(386), C(87), D(36), E(0) #1201039