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【简答题】
沿水平方向的外力F将物体A压在竖直墙上,如图所示。由于物体与墙之间有摩擦力,此时物体保持静止,并设其所受静摩擦力为f 0 ,若外力增至2F,则此时物体所受静摩擦力为____。
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【单选题】实验性增加细胞外液[K+]，可导致
A.
静息电位下降，动作电位下降
B.
静息电位升高，动作电位升高
C.
静息电位下降，动作电位升高
D.
静息电位升高，动作电位下降
E.
静息电位和动作电位不受影响
【简答题】In almost every big university in the USA , football is a favorite sport. American football is not like soccer. Players sometimes kick the ball, but they also throw the ball and run with it. They try ...
【简答题】In almost every big university (大学) in the United States, football is a favourite sport. American football is different. Players sometimes kick the ball, but they also throw the ball and run with it. ...
【简答题】In almost every big university in the United States football is a favorite sport. American football is not like soccer. Players sometimes kick the ball,but they also throw the ball and run with it. Th...
【简答题】In almost every big university in the United States, football is a favourite sport. American football is different. Players sometimes kick the ball, but they also throw the ball and run with it. They ...
【多选题】下列关于静息电位的论述，正确的是( )
A.
静息电位都是稳定的静息电位
B.
主要由K + 外流形成
C.
静息电位的大小接近K + 的平衡电位
D.
不同细胞静息电位数值不同
E.
静息电位的数值随细胞外液中K + 的浓度的变化而相应变化
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