单项选择题

对于晶体中的电子，平移算符与哪个算符对易？
A、动量算符
B、角动量算符
C、哈密顿算符
D、角动量算符的平方

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多项选择题

《小马过河》故事中哪些角色运用了角色面具动作练习？
A、小马
B、牛婆婆
C、小松鼠

单项选择题

Miniskirt was perhaps the most important development in fashion in the 1950s， invented by Mary Quant a British designer， she began a major international fashion.

A.正确
B.错误