泌乳（lactation）是哺乳动物以分娩成功为标志的周期性生殖活动过程中的最后一个阶段。 A: 正确 B: 错误

Thyroid hormone A: directly promote long bone and cartilage growth B: reduce blood glucose C: start and maintain lactation D: promote the growth and development of the brain and long bones

Which one is not the etiology of Rickets of vitamin D deficiency? () A: Deficiency in maternal pregnancy and lactation B: Inadequate cutaneous synthesis C: Increased requirement and inadequate dietary intake D: Diseases' and Drug's effects E: Outdoor activity