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【单选题】
执业兽医考试:(2011)74.调节子宫颈平滑肌的紧张性,影响精子在雌性动物生殖道中运行、受精、胚胎着床和分娩等生殖过程的激素是A.
绒毛膜促性腺激素
B.
前列腺素E
C.
前列腺素
D.
褪色素
E.
前列腺素
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B.
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