单项选择题

细胞膜内外正常的Na+浓度差和K+浓度差的形成与维持是由于 A.
膜在安静时对K+通透性大 B.
膜在兴奋时对Na+通透性增加 C.
Na+、K+易化扩散的结果 D.
膜上钠--钾泵的作用

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单项选择题

At the opening ceremony of the _______ for the first time, 10 refugee athletes, representing 65 million displaced people around the world, took to the stage.
A、Athens Olympics
B、BeijingOlympics
C、SydneyOlympics
D、Rio Olympics

所有结构都需要计算竖向地震作用( )。
A、正确
B、错误

答案：错误