皮皮学，免费搜题
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搜题
【单选题】
下列哪项不是受精卵着床的必备条件A.
透明带消失
B.
合体滋养细胞合成
C.
子宫内膜增殖期改变
D.
囊胚和子宫内膜的发育必须同步
E.
有足量的孕酮支持
拍照语音搜题，微信中搜索"皮皮学"使用
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皮皮学刷刷变学霸
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