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【单选题】
多电子原子中决定电子能量的量子数( )。A.
n
B.
n ， l
C.
n ， l ， m
D.
n ， l ， m ， s i
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【单选题】地下室的输水管内径为2.5cm,管内水的流速为0.80m/s,压强为180kPa。如果水从地下室流到高出输入点7.6m的二层楼时,所用管径缩小为1.2cm,那么水到二层楼时的流速和水的压强是:(g=9.8m/ )
A.
流速为 4.78m/s，水压为： 78.3kPa
B.
流速为 2.56m/s，水压为： 101.1kPa
C.
流速为 3.9m/s，水压为： 88kPa
D.
流速为 3.47m/s，水压为： 99.82kPa
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