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【单选题】
初产妇枕先露时,开始保护会阴的时间是
A.
开全时
B.
胎头着
C.
在阴道口可以见到胎头时
D.
胎头拨露使阴唇后联合紧张时
E.
胎头复位时
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A.
报文、帧、比特
B.
比特、分组、帧
C.
报文、分组、比特
D.
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【单选题】物理层、数据链路层和网络层的PDU分别是
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B.
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C.
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D.
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A.
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B.
“罗森塔尔效应”
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A.
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B.
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A.
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B.
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C.
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D.
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