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【单选题】
老年人的睡眠时间主要安排在:A.
上午和夜间
B.
中午和夜间
C.
上午和中午
D.
上午和下午
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举一反三
【简答题】加注冷却水时,最好选择
【简答题】????????D ?Many people thought babies were not able to learn things until they were five or six month sold. But doctors now say babies begin learning on their first day of life. A baby will smile if h...
【单选题】A common character of the things used for money was that they________.
A.
were difficult to get
B.
had some practical use
C.
were considered valuable by all people
【单选题】一台额定功率为50MW的发电机带一个40MW负荷运转,发电机的调差系数为4%,负荷的单位调节功率为1.5,那么系统的单位调节功率为( )。
A.
32.75
B.
29.75
C.
26.5
D.
23.5
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