43.十二指腸腺(Brunner's gland)位於:
(A)黏膜(mucosa)
(B)黏膜下層(submucosa)
(C)外肌層(muscularis externa)
(D)外膜(adventitia)
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統計: A(25), B(787), C(7), D(2), E(0) #2756692
統計: A(25), B(787), C(7), D(2), E(0) #2756692