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问题详情

新生儿每天睡眠时间长达( )

A、16~18小时    

B、18~20小时    

C、20~22小时    

D、22~24小时 

时间：2021-09-01 23:21 关键词：联大许昌学院学前卫生学

答案解析

B

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