单项选择题

氢原子的轨道为，其角动量z分量的取值为：‌

A．

B．

C．

D．

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多项选择题

哪些患者不能服用二甲双呱？
A、严重感染和外伤、重大手术
B、低血压和缺氧
C、维生素B12、叶酸和铁缺乏
D、急性心肌梗死
E、肺功能不全

Contextualization is introduced by Hymes to refer to the shared construction of context by the participants in the course of their interaction.

答案：错误