题目内容
（请给出正确答案）
A.不随刺激强度的变化而变化
B.不随细胞外Na+浓度的变化而改变
C.不随传导距离而改变
D.不随细胞的种类而改变
E.不随细胞所处环境温度的变化而变化
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更多“单一神经纤维动作电位的幅度”相关的问题
A. 传入神经纤维的动作电位波形特征
B. 单一神经纤维动作电位的幅度高低
C. 单一神经动作电位的频率的高低
D. 参与电信号传输的神经纤维数目的多少
E. 受刺激感受器的种类
B、细胞外液Na+浓度降低,动作电位幅度降低
C、锋电位产生期间Na入K+的跨膜转运都是经通逆易化扩散
D、维持细胞产生动作电位能力是通过继发性主动转运完成
A．11．79
B．10．18
C．9．21
D．13.75
The only solid piece of scientific truth about which I feel totally confident is that we are profoundly ignorant about nature. I regard this as the major discovery of the past hundred years of biology. It is, in its way, an illuminating piece of news. It would have amazed the brightest minds of the 18th century Enlightenment to be told by any of us how little we know and how bewildering seems the way ahead. It is this sudden confrontation with the depth and scope of ignorance that represents the most significant contribution of the 20th century science to the human intellect. In earlier times, we either pretended to understand how things worked or ignored the problem, or simply made up stories to fill the gaps. Now that we have begun exploring in earnest, we are getting glimpses of how huge the questions are, and how far they are from being answered. Because of this, we are depressed. It is not so bad being ignorant if you are totally ignorant; the hard thing is knowing in some detail the reality of ignorance, the worst spots and here and there the not-so-bad spots, but no true light at the end of the tunnel nor even any tunnels that can yet be trusted.
But we are making a beginning, and there ought to be some satisfaction. There are probably no questions we can think up that can't be answered, sooner or later, including even the matter of consciousness; to be sure, there may well be questions we can't think up, ever, and therefore limits to the reach of human intellect, but that is another matter. Within our limits, we should be able to work our way through to all our answers, if we keep at it long enough, and pay attention.
The author claims that good science ______.
A．defies prediction
B．should study the unknown
C．should discover scientific truth
D．should offer choices rather than prescribe
(1)桶的容积是40升
(2)桶的容积是60升
A．条件(1)充分，但条件(2)不充分。
B．条件(2)充分，但条件(1)不充分。
C．条件(1)和(2)单独都不充分，但条件(1)和条件(2)联合起来充分。
D．条件(1)充分，条件(2)也充分。
E．条件(1)和(2)单独都不充分，条件(1)和条件(2)联合起来也不充分。
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