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【多选题】
妇女孕期内分泌有哪些变化A.
人绒毛膜促性腺激素升高，刺激母体孕酮分泌，降低淋巴细胞活力，防止母体对胎儿的排斥反应
B.
人绒毛膜生长素升高，降低母体对葡萄糖利用，使更多葡萄糖转运至胎儿
C.
雌激素水平升高，促进催乳素细胞生长，为泌乳做准备
D.
甲状腺激素分泌增加，使基础代谢水平在孕晚期增加15-20%
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