某小学教师以行程问题为例讲授有理数的加减法：“一个人从家出发，先向北走30米，继续向北走20米，离家的距离多远？什么方向？如果规定向北为正，向南为负，如何用数学式子来表示和计算？”学生答：“离开家50米，他在家的北边。表示为(+30)+(+20)=+50”；随后，教师依次提出了“先向南走30米，又向南走20米”、“先向北走30米，转头再向南走20米”、“先向南走30米，返回头向北走20米”几个问题，学生也都一一正确作答。教师引导学生思考：“从上面的例子中，我们可以看出正负有理数相加的结果有没有一定规律呢？大家想想‘和的符号与两个加数符号有什么关系？’、‘和的绝对值和两个加数的绝对值又有什么关系？’先给大家一段思考的时间，我们再回到刚才的实例中，大家一起找找规律。”接着，教师又连续提问“还是这个人，出门先向北走20米，转身向南还走20米，结果怎样？”、“他出门先向南走20米，转身原地没动呢？”学生也能正确作答。教师引导学生进行总结：“通过刚才的例子，再想一想，有理数加法的法则是什么？”经过几个学生的发言和讨论，得出结论—有理数相加的规则是：两个加数同号时，结果取原来的符号，并把绝对值相加；两个加数异号时，结果取绝对值较大的加数的符号，并用较大的绝对值减去较小的绝对值。最后，教师引导学生对于“这个人朝着相反方向走了相等距离”这个特例进行思考和练习。
请结合案例，从教育心理学的角度，分析这节课的优点有哪些？
In order to work here the foreigner needs a work permit, which must be (21) for by his prospective employer. The problem here is that the Department of Employment has the right to (22) or refuse these permits, and there is little that can be (23) about it, it would be extremely unwise (24) a foreign visitor to work without a permit, since anyone doing so is (25) to immediate deportation. There are some (26) to this rule, most notably people from the Common Market countries, who are (27) to work without permits and who are often given (28) residence permits of up to five years. Some (29) people, such as doctors, foreign journalists, authors and others, can work without (30)
The problem with the Act is not just that some of its rules are (31) but (32) it is administered, and the people who administer it.
An immigration official has the power to stop a visitor <
A. applied
B. made
C. asked
D. wait
| It is difficult to say exactly how the
music we call "rock" or "rock and roll" began. Its roots go back to many
different countries and many different kinds of music and musicians. Rock music developed mainly from the interaction of black African and white European music. The Europeans and the African slaves who came to America during the seventeenth century each had their own different kinds of music. Black Africans used heavy drumbeats, a rough singing voice, and the calling of a melody and answer of a chorus. The white Europeans, mostly English and Scots, used a stronger melody, a less heavy beat, and instruments such as guitars, horns, and fiddles. The history of rock and roll is the history of how rock evolved from these two traditions. From the seventeenth to the twentieth century, musicians in the southern United A. h is not easy to tell how "rock and roll" began. B. Both the blues and country music were developed by the musicians in the southern United States. C. Both the Europeans and the African slaves came to America during the 17th century. D. The blues songs recorded in Memphis made Elvis Presley popular throughout the world. [多项选择]获国家计委或中国工程咨询协会优秀工程咨询成果奖项目及全国优秀工程勘察设计奖项目的主要完成人，在报考注册咨询工程师(投资)可以免试( )。
A. 《工程咨询概论》 B. 《现代咨询方法与务实》 C. 《项目决策分析与评价》 D. 《宏观经济政策与发展规划》 E. 《项目组织与管理》 [多选题]同杆架设的高压与低压配电线路,(?)的横担距上下横担为1.00m。
A.干线 B.分支 C.转角杆 D.直线杆 [多选题]物的不安全状态中，机械的（）环节也都存在着不同的潜在危险因素。
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A.和人身等高 B.身高的一半 C.身高的1/4 D.身高的1/3 [单选题]使用雷达定位中,利用雷达两距离定位比雷达两方位产生的误差_.
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A.局域网 B.城域网 C.广域网 D.因特网 [多选题]信贷资产按风险分类划分为（）。
A.、关注 B.、正常 C.、次级 D.、可疑 E.、损失 F.略 G.略 我来回答: 提交
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