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【单选题】
关于月经周期血中激素浓度变化的叙述,错误的是A.
雌激素有两次高峰
B.
排卵前出现孕激素高峰
C.
LH在排卵前达高峰
D.
FSH与LH的高峰同步出现
E.
月经前血中雌、孕激素浓度均会急剧下降
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【单选题】设有关系 R 和 S ,在下列的关系运算中,( )运算不要求 R 和 S 具有相同的目数,也不要求对应属性的数据类型相同。
A.
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