41. 下列何者其上皮細胞具刷狀緣(brush border)？ (A)乳突管(papillary duct) (B)亨氏襻細肢(thin limb of Henle’s loop) (C)近曲小管(proximal convoluted tubule) (D)遠曲小管(distal convoluted tubule) 4