经细胞动作电位的下降支主要是（）外流的结果A.Na+ B.K+ C.Cl- D.Ca_爱下问搜题

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问题单项选择题 A1型题

经细胞动作电位的下降支主要是（）外流的结果

A.Na⁺

B.K⁺

C.Cl^-

D.Ca²⁺

E.Mg²⁺

答案

参考答案：B

选择题

--- ______ Linda often ______ kites in the park in spring?

--- Yes, she often ______ kites with her friends and sometimes they have a picnic together.[ ]

A. Does, fly, flies

B. Do, fly, flies

C. Are, fly, flies

D. Is, fly, flies

单项选择题

第三自然段的6句话，合理的顺序是

A．①②③④⑤⑥

B．①④⑤③⑥②

C．⑥①②③④⑤

D．①③④⑤②⑥