题目内容
当局部电位信号高于一定数值时,钠通道打开,快速引起去极化,产生动作电位。()
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CRH380B型动车组转向架的轴箱定位方式是
CRH380B型动车组为按照有无动力，分为动车转向架和拖车转向架.而且采用模块化设计，所有转向架的主要模块是相同的。
Fill in the blanks without referring to the original text. Then check your answers against the original. After that, read the passage aloud until you can say it from memory.You have known your high school friends very well. You have had so many 1) together, and had these amazing bonds that you have 2) over the years. But with college friends, it's a different story: You don't always 3) who your friend really is. I call those friends 4) friends, and everybody has them and they're just people who are in your 5) circle, or in your immediate community with whom you become 6) .
Even if I'll spend six weeks doing the job, I am determined to take it.（同义句改写）
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