不确定性是指基干某一事件发生的结果的概率为( )。A．0 B．1 C．大于0 D．

（1）工业上以粗铜为原料采取如图所示流程制备硝酸铜晶体：

①在步骤a中，还需要通入氧气和水，其目的是______．

②在保温去铁的过程中，为使Fe³⁺沉淀完全，可以向溶液中加入CuO，调节溶液的pH，根据下表数据，溶液的pH应保持在______范围．

	氢氧化物开始沉淀时的pH	氢氧化物沉淀完全时的pH
Fe3+ Cu2+	1.9 4.7	3.2 6.7

不用加水的方法调节溶液pH的原因是______．

③进行蒸发浓缩时，要用硝酸调节溶液的pH=1，其目的是（结合离子方程式说明）______．

（2）工业上常利用硝酸铜溶液电镀铜，电镀时阴极的电极反应式是______．

（3）图是某小组同学查阅资料所绘出的硝酸铜晶体[Cu（NO₃）₂•nH₂O]的溶解度曲线（温度在30℃前后对应不同的晶体），下列说法正确的是______（填字母）．

a．A点时的溶液为不饱和溶液

b．B点时两种晶体可以共存

c．按上述流程最终得到的晶体是Cu（NO₃）₂•3H₂O

d．若将C点时的溶液降温至30℃以下，可以析出Cu（NO₃）₂•6H₂O晶体

（4）某些共价化合物（如H₂O、NH₃、N₂O₄等）在液态时有微弱的导电性，主要是因为发生了电离，如：2NH₃

NH₄⁺+NH₂^-，由此制备无水硝酸铜的方法之一是用Cu与液态N₂O₄反应．液态N₂O₄电离得到的两种离子所含电子数相差18，则液态N₂O₄电离的方程式是______；Cu与液态N₂O₄反应制得无水硝酸铜的化学方程式是______．

The first and most important agents of socialization are the people who care for infants. In the earliest months, messages from nurturers constitute the child’’s basic understanding of the world around it. This is the infant’’s first introduction to the language that shapes perception and elicits emotion.Another powerful source of information and socialization is the friendship of peers. Peers are equals that one can deal with on the same level as oneself, whereas parents are superiors. The heavy emotional overlay of family relationships makes some kinds of learning difficult.Much formal socialization is placed in the hands of professionals. Teachers from kindergarten on are specifically designated agents of socialization. Ideally, a teacher is one who has both knowledge and the skills to present it. During the course of teaching their subjects, classroom instructors provide role models and attempt to convey the excitement of learning itself.In earlier times, parents, friends and teachers would comprise the list of primary childhood socializers. Children’’s books, comics and magazines might also have been mentioned as sources of information on norms and role models. Today one must add three powerful indirect or non-personal socialization agents: radio, movies and television. Many people learn about politics, form a vision of well-being, and develop attitudes towards others from what they see on the screen and hear through the speakers.

Peers are one of the ________agents of socialization.

A．formal

B．indirect

C．primary

D．personal

退行性骨关节病中软骨被侵蚀破坏，在X线片上表现为（）

A.骨端硬化

B.关节间隙变窄、消失

C.关节变形及排列不良

D.关节内骨性游离体形成

E.边缘性骨赘形成

指令是用来规定计算机执行的操作和操作对象所在存储位置的一个______。其中操作码用来指出计算机应执行何种操作的一个______，操作数地址指出该指令所操作(处理)的对象(称为操作数)所在存储单元的地址。

以政府调研员的身份，用不超过350字的篇幅，提出解决给定材料所反映问题的方案。要有条理地说明，要体现针对性和可操作性。