下列电缆全程的屏蔽护层的电阻值计算公式，正确的是（）。 A.RS=（RAE+RBE-

2013年3月22～30日，中国国家 * * 出访了俄罗斯、坦桑尼亚、南非和刚果共和国四国，下图是出访路线示意图。据图文回答下列各题。

小题1:出访地中

A．①所在国家属于亚洲

B．②位于板块张裂地带

C．③东岸受寒流影响显著

D．④地盛行东北信风小题2:出访期间

A．①昼渐长，夜渐短

B．②和③的日出时刻相同

C．③正午太阳高度角渐大

D．④自转角速度变小小题3:出访路线中

A．北京和①地年均温差异最大

B．②和③之间干湿差异最大

C．①至②自然带景观变化最多

D．③至④沿线均为高原地形

进口国在总配额内按国别和地区分配一定的配额，超过该配额便不准进口，它是（）。

A．关税配额

B．全球配额

C．国别配额

D．总配额

下列哪项不是缺隙保持器的适应症

A．恒牙胚牙冠上覆盖有较厚的骨组织

B．一侧或双侧多数乳磨牙早失，影响患儿咀嚼功能者

C．恒牙胚牙根已形成1/2以上者，牙冠上无骨组织覆盖者

D．乳牙早失、恒牙胚牙根形成不足1/2

E．间隙缩小或有缩小趋势者

顺序存储方法是把逻辑上相邻的结点存储在物理位置 【2】 的存储单元中。

The increasingly high rates of juvenile delinquency are a great problem in modem society. More and more people are paying special attention to it.

When it comes to the reasons, here are two of them. Modem youth are more revolutionary and more independent than the elder generation. When this tendency goes to an extreme, problems arise. Some of the young want to throw away all the traditional principles and beliefs, most of which are very good for self-cultivation. They are reluctant to listen to the advice from elder generation. If they behave in the way, as they like, they might commit crimes without realizing it. Studies also show that juvenile-delinquency rates are twice as high for youngsters from single-parent homes as for those in traditional households. Children in single-parent families are taken less care of and thus have feelings of being neglected, discriminated and isolated. The lack of parental love makes them hostile and cynical towards the society.

There are several ways to prevent the youth from committing crimes. School education plays an important role to teach traditional beliefs. Books and programs should be in good quality. There should be more educational books and programs for young children to tell them how to distinguish the right from the wrong. Also, mutual understanding between parents and children is also very important. Parental supervision and guidance are a key factor of self-cultivation in lifetime. The two generations need to smooth away disagreement. Parents can spend much time staying with their children and patiently carry out the duty of family education.

And others are starting to pay attention to another problem in modern society that may underline all sorts of crimes, including juvenile delinquency, though it is believed that the development of information technology has made the world smaller. Modern people have greater tensions so that they have less time to communicate with each other. More and more people are living in urban areas, where life is in a quick rhythm. Due to fierce competition, which is the most important reason of all, city dwellers have to be working hard in order to keep up with the steps of city life. Everybody is busy all the time. Work pressures deprive them of a casual way of life. Moreover, living in apartments in different blocks, people are isolated from each other. It is not convenient for them to meet each other freely.

What is the " another problem " mentioned in paragraph 4（）

A. A lot of problems have been caused by information technology

B. Modern people are feeling isolated from each other

C. Competition is much more severe than ever before

D. Modern society hosts all sorts of crimes