题目内容

After listening to the conversation above, choose the best answer.What are the speakers doing ?

A. Discussing a new project
B. Chatting about their work
C. Participating in a job interview
D. Arranging a sales meeting

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A. Selling audio products
B. Designing speakers
C. Launching new video games
D. Supervising company management

A. K+
B. Na+
Cl-
D. Ca2+

ACh释放减少
B. ACh释放增多
C. 胆碱酯酶活性降低
D. 胆碱酯酶活性增强

A. Na+内流
B. K+ 内流
Ca2+内流
D. K+ 外流