褪黑激素除了具有与促黑激素相反的功能外,还具有() ["A.促进性腺的发育","B.抑制性腺的发育","C.促进视网膜的发育","D.促进生长发育"]
下列哪一类动物的肾上腺皮质和髓质是独立的,在结构和功能上互不相关() ["A.鱼","B.蛇","C.鸟","D.牛"]
起源与鳃裂有关的内分泌腺是() ["A.甲状腺","B.肾上腺","C.甲状旁腺","D.以上都不是"]
下列哪项不是甲状旁腺素的生理功能() ["A.促进肾小管对钙的重吸收","B.抑制骨骼中钙盐的溶解和释放","C.激活维生素D","D.促进肾小管对磷酸盐的重吸收"]
观看马术比赛有哪些礼仪要求?
拉拉队在比赛时有哪些礼仪要求?