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【单选题】
根据离子学说,动作电位的产生是由于A.
K + 停止外流
B.
K + 突然迅速外流
C.
Na + 迅速大量外流
D.
Na + 迅速大量内流
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皮皮学刷刷变学霸
举一反三
【简答题】draw the line
【简答题】Listen and draw a line.
【单选题】In radio and television ______ impossible to draw the line between news and entertainment programs.
A.
frequently is
B.
are frequently
C.
it is frequently
D.
where they are frequently
【简答题】First draw a line the middle of the page. Then write a word in the space above the line. A. across 13. over C. between D. within
【简答题】draw the line
【单选题】I lunch when I learned that former British prime minister Margaret Thatcher had passed away.
A.
ate
B.
had eaten
C.
was eating
D.
were eating
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