主量子数为（）的一个电子,它的角量子数的可能取值有 4 种,它的磁量子数的可能取值有（） 种.
查看答案
金属铬的价电子排布式是 3d54s1。
A. 对
B. 错
The wife put shelf-paper in the cabinet to ___________.
A. make it beautiful.
B. keep the dust away.
C. stop the cat from climbing into it.
The wife wouldn't let her baby cry because ___________.
A. she wants the baby to be happy.
B. crying is not good for the lung.
C. She doesn't like to hear somebody cry.
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