腎小管何處不具分泌作用？(1)近曲小管(proximal convoluted tubule)(2)亨利氏環(loop of Henle)(3)遠曲小管(distal convoluted tubule)(4)集尿管(collecting duct)
(A)(1)
(B)(2)
(C)(3)
(D)(4)

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統計： A(7), B(19), C(6), D(28), E(0) #278240