搜题请搜索小程序“爱下问搜题”
问题 不定项选择题

下图是Zn和Cu形成的原电池，某实验兴趣小组做完实验后，在读书卡片上记录如下：

No．28 Date 2010. 11. 08 实验后的记录：

①Zn为正极，Cu为负极。

②H+向负极移动。

③电子流动方向是Zn→Cu。

④Cu电极上有H2产生。

⑤若有1mol电子流过导线，则产生H2为0.5mol。

⑥正极的电极反应式为：Zn-2e-=Zn2+

在卡片上，描述合理的是

[ ]

A．①②③

B．③④⑤

C．④⑤⑥

D．②③④

答案

答案：B

填空题

为减轻慢性肾衰竭患者的水肿应严格控制好出、入水量，强调__________，为减轻患者的烦渴症状可____________，并限制__________摄入。
查看答案
问答题

Almost all our major problems involve human behavior, and they cannot be solved by physical and biological technology alone. What is needed is a technology of behavior, but we have been slow to develop the science from which such a technology might be drawn, (46) One difficulty is that almost all of what is called behavioral science continues to trace behavior to states of mind, feelings, traits of character, human nature, and so on. Physics and biology once followed similar practices and advanced only when they discarded them, (47) The behavioral sciences have been slow to change partly because the explanatory items often seem to be directly observed and partly because other lands of explanations have been hard to find. The environment is obviously important, but its role has remained obscure. It does not push or pull, it selects, and this function is difficult to discover and analyze. (48). The role of natural selection in evolution was formulated only a little more than a hundred years ago, and the selective role of the environment in shaping and maintaining the behavior of the individual is only beginning to be recognized and studied. As the interaction between organism and environment has come to be understood, however, effects once assigned to states of mind, feelings, and traits are beginning to be traced to accessible conditions, and a technology of behavior may therefore become available. It will not solve our problems, however, until it replaces traditional pre-scientific views, and these are ply entrenched. Freedom and dignity illustrate the difficulty. (49) They are the possessions of the autonomous (self-governing) man of traditional theory, and they are essential to practices in which a person is held responsible for his conduct and given credit for his achievements. A scientific analysis shifts both the responsibility and the achievement to the environment. It also raises questions concerning "values". Who will use a technology and to what ends (50) Until these issues are resolved, a technology of behavior will continue to be rejected, and with impossibly the only way to solve our problems.

(46) One difficulty is that almost all of what is called behavioral science continues to trace behavior to states of mind, feelings, traits of character, human nature, and so on.
查看答案