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【单选题】
下列关于神经纤维动作电位的描述,正确的是 :A.
刺激强度小于阈值时，出现低幅度的动作电位
B.
动作电位的大小随着传导距离的增加而变小
C.
动作电位一旦产生，可沿细胞膜作电紧张传播
D.
刺激强度达到阈值时，再增加刺激强度，则动作电位的幅度随之增大
E.
不同可兴奋细胞动作电位的幅度和持续时间可以不一样
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【简答题】The original 13-star version of the national flag of the United States was first adopted on June 14, 1777 and the current 50-star version was adopted on July 4, __________.
【单选题】According to the short passage, the original price of the shoes is about
A.
$37.3
B.
$39.9
C.
$45
D.
$50
【判断题】50% of the original fare will be paid within 2 hours before the departure time.
A.
正确
B.
错误
【简答题】A．The bookstore pays 50% of their original value for the books if the professor changes texts. B．The bookstore pays 50% of their original value for the books in good condition. C．The bookstore pays 50...
【简答题】Read the following summaries of the original text and decide which
one retains the main idea with vocabulary and structure changed. "The number of everweight children is predicted to rise significant...
【简答题】Directions: The following emails were written to the contact person of an international conference. Select one of them to comment with no less than 50 words. "[...]" is used to indicate the deleted pa...
【判断题】We usually grasp only 50% of what we hear. After 24 hours we can remember only 10 percent of the original message.
A.
正确
B.
错误
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