某投资者共拥有20万元总资本,准备在黄金期货上进行多头交易,当时,每一合约需要初始保

题型:单项选择题

问题:

某投资者共拥有20万元总资本,准备在黄金期货上进行多头交易,当时,每一合约需要初始保证金2500元。当采取10%的规定来决定期货头寸多少时,该投资者最多可买入()手合约。

A.4 

B.8 

C.12 

D.20

考点:期货从业考试期货基础知识期货基础知识13
题型:单项选择题

麦粒肿早期的超短波、紫外线治疗应采用小剂量,原因是

A.紫外线红斑影响美观

B.紫外线色素沉着影响美观

C.大剂量紫外线引起电光性眼炎

D.大剂量治疗会引起黏膜水肿

E.大剂量治疗会引起红肿加重

题型:单项选择题

下列关于神经纤维膜上电压门控Na+与K+道共同点的描述,错误的是

A.都有开放状态

B.都有关闭状态

C.都有激活状态

D.都有失活状态

题型:单项选择题

如图所示,由六根相同的金属棒组成了一个“6”字形的框架,每根金属棒长为L,电阻为R,匀强磁场的宽度也为L.设框架在通过磁场过程中以速度v做匀速直线运动,从ab进入磁场开始计时,f、c两点的电势差Ufc随距离变化的图象正确的是(  )

A.

B.

C.

D.

题型:单项选择题

磁粉检测方法的局限性在于()。

A.只能检测试件开口表面的缺陷

B.只能发现表面和近表面缺陷

C.只限用于导电材料

D.工艺复杂、费用昂贵

题型:单项选择题

Of all the areas of learning the most important is the development of attitudes.. emotional reactions as well as logical thought processes affect the behavior of most people. "The burnt child fears the fire" is one instance; another is the rise of despots like Hitler. Both these examples also point up the fact that attitudes come from experience. In the one case the experience was direct and impressive; in the other it was indirect and cumulative. The Nazis were influenced largely by the speeches they heard and the books they read.

The classroom teacher in the elementary school is in a strategic position to influence attitudes. This is true partly because children acquire attitudes from those adults whose words are highly regarded by them.

Another reason it is true is that pupils often devote their time to a subject in school that has only been touched upon at home or has possibly never occurred to them before. To a child who had previously acquired little knowledge of Mexico his teacher’s method of handling such a unit would greatly affect his attitude toward Mexicans.

The media through which the teacher can develop wholesome attitudes are innumerable. Social studies (with special reference to races, creeds and nationalities), science matters of health and safety, the very atmosphere of the classroom... these are a few of the fertile fields for the inculcation of proper emotional reactions.

However, when children go to school with undesirable attitudes, it is unwise for the teacher to attempt to change their feelings by cajoling or scolding them. She can achieve the proper effect by helping them obtain constructive experiences.

To illustrate, first-grade pupils afraid of policemen will probably alter their attitudes after a classroom chat with the neighborhood officer in which he explains how he protects them. In the same way, a class of older children can develop attitudes through discussion, research, outside reading and all-day trips.

Finally, a teacher must constantly evaluate her own attitudes, because her influence can be negative if she has personal prejudices. This is especially true in respect to controversial issues and questions on which children should be encouraged to reach their own decision as a result of objective analysis of all the facts.

The text specially states that()

A. direct experiences are more valuable than indirect ones

B. whatever attitudes a child learns in school have already been introduced at home

C. teachers can sometimes have an unwholesome influence on children

D. teachers should always conceal their own attitudes

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