根据《混凝土结构工程施工规范》中的强制性要求，对有抗震设防要求的结构，其纵向受力钢筋的性能应满足设计要求，其强度和最大力下总伸长率的实测值，应符合下列哪些规定（）

A.钢筋的抗拉强度实测值与屈服强度实测值的比值不应小于1.25

B.钢筋的屈服强度实测值与屈服强度标准值的比值不应大于1.30

C.钢筋的最大力下总伸长率不应小于9%

D.钢筋的抗拉强度实测值与屈服强度实测值的比值不应小于1.2

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 of these examples also point up the fact that attitudes stem from experience. In the one case the experience was direct and impressive, in the other case it was indirect and cumulative. The Nazis were formed largely by the speeches they heard and the books they read.
The classroom teachers in the elementary school are in a strategic position to influence attitudes. This is true partly because children acquire attitudes from those adults whose opinion they respect.
Another reason is that pupils often delve somewhat deeply into 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 towards Mexicans.
The media through which the teacher can develop wholesome attitudes are innumerable. Social attitudes (with special reference to races and nationalities) science matters of health and safety, the very atmosphere of the classroom--these are a few of the fertile fields for the induction of proper emotional reactions.
However, when children come to school with undesirable attitudes, it is unwise for the teacher to attempt to change their feelings by cheating or scolding them. She can achieve the proper effect by helping them obtain constructive experiences. Finally, a teacher must constantly evaluate her own attitudes, because her influence can be harmful 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 decisions as a result of objective analysis of all the facts.

In the second paragraph, the author gives two examples to show ______.

A. the development of attitudes is most important
B. people’s behavior can be shaped by direct or indirect experience
C. conscious instruction is important in shaping people’s behavior
D. unpleasant experience leaves a greater impression on people