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【单选题】
前寒武纪时期是( )。A.
地球形成到生命出现时期
B.
地球形成到原核生物出现
C.
地球形成到原核生物出现时期
D.
地球形成到5.7亿年这段时期
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【单选题】枕先露胎头到达盆底俯屈后以哪条径线适应产道继续下降
A.
从有规律宫缩到胎儿娩出
B.
从有规律宫缩到宫口开全
C.
从有规律宫缩到胎盘娩出
D.
从宫口开全到胎儿娩出
E.
从胎儿娩出到胎盘娩出
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