题型:名词解释 Rock-climbing is a breathtaking activity, very popular nationwide among young people, cooperation as well as courage plays an important role.A.whoB.whichC.thatD.where 查看答案
题型:名词解释 1,25-(OH)2D3的生理功能有()A.增加肠道钙、磷的吸收B.增加肾小管对钙的重吸收C.抑制肾小管对磷的重吸收D.刺激成骨细胞促进骨样组织成熟和钙盐沉积E.与甲状旁腺协同使破骨细胞成熟,促进骨重吸收 查看答案