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【单选题】
When principle quantum number n=4,what is the maximum value of m l ?A.
2
B.
4
C.
3
D.
0
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【单选题】如图为研究电磁感应现象的实验装置,下列哪种情况电流表指针不会偏转( )
A.
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B.
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C.
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D.
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