问题
单项选择题
心肌工作细胞具有兴奋性的前提是Na+通道处于
A．启动状态
B．备用状态
C．激活状态
D．失活状态
E．超极化状态
答案
参考答案：B
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心肌工作细胞具有兴奋性的前提是Na+通道处于
A．启动状态
B．备用状态
C．激活状态
D．失活状态
E．超极化状态
参考答案：B
More Than I Had Dreamed Of From the time I was seven, I had a dream of becoming a member of the Students Union. I always my school leaders for taking responsibility for all of us. So I dreamed of being a leader. Years flew by, and soon I was able to participate in the elections, I would win. But the reality struck that I hadn’t had a chance. I wasn’t pretty. Girls across the school hardly knew me. I just did not have what it to win a school election. I was . As I cried in my room that evening, I took a deep breath and decided I wouldn’t stop dreaming. I decided that I would elections again in my final year at school—and I would win. I recognized that my had a lot of things in their favor. What were the that would work in my favor? I had good grades, and I was friendly and helpful. And my biggest was the faith I had. I would not allow my appearance to hold me back from putting my best foot forward. That evening, I my election plans a whole year in advance. I realized that girls would have to get to know me and recognize that I had the ability to them. I loved making friends and I liked being helpful, I decided that perhaps I could use these qualities to work to my advantage. In order to learn how to present a great election , I also attended a course on effective public speaking. The day after the election, when the principal(校长) announced I won the second highest number of votes, the students . That joy on the faces of all my friends showed me that my victory was theirs. Suddenly, I realized that I had much more than I had dreamed of. I had made many new friends and had helped people the way. I had won the and love of my school-mates and they knew me as somebody who would stand by them. I was able to put a smile on their faces and their day.
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