下列哪项是计划工作的原则？（） A.弹性原则 B.目标原则 C.规划原则 D.策略原

桩台为预制安装结构时，为了预制梁和板的安装，桩的顶端设置（），以调整打桩时产生的（）和（）的偏差。

Why should I teach my children history? That sounds like a stupid question to even ask. But, as I hear different home schooling teachers discuss history, I get the idea that there may be different reasons for teaching history. Let me briefly explain the three good reasons for studying history and two bad reasons for studying history.

The major reason I see for studying history is that we can learn from the past. I am convinced that the world would be a much better place if more people understood the successes and failures of the past and the things that made these successes and failures. However, as the unfortunately true statement goes “the one thing we seem to learn from history is that we don’t seem to learn from history. ”Perhaps at least in teaching history, to my children I can do a small part in changing this.

A second major reason for studying history is that it is hard to understand the current political climate in the absence of an understanding of its historical context. We can not even understand who we are and where we are without history, much less try to figure out where we are going or how we should get where we want to be.

I teach my children history, for one more reason. I purchased a set of historical audio tapes for our children. My seven-year-old son listened to them over and over. It was my hope that he would become inspired by the accomplishments of people like the Wright brothers to accomplish things by himself. I think that it is good that we celebrate the accomplishments of people like Martin Luther King Jr. In doing so, young people are called on to stand for the principles that he stood for and accomplish what he accomplished. I also think that by studying people like Adolph Hitler, people can learn to stand against the things that he stood for.

1. What message can we get from the underlined sentence in Paragraph 2?

A. Many people aren’t clever enough to learn well from the past.

B. Many people fail to make good use of history and make the same mistakes.

C. Many people feel it hard to understand history.

D. Many people have no interest in studying history.

2. In Paragraph 3, the author shows that history is useful because

A. it makes the current political situation go smoothly

B. it helps us realize the importance of historical events

C. it helps us understand why things are the way they are

D. it helps people accept the present situation where they live

3. Some historical figures are mentioned in the last paragraph to show

A. people can be inspired to do good, while also learning to fight against evil

B. people may also learn from bad historical figures

C. more celebrations should be held to honor their achievements

D. today’s people can also achieve what they achieved

4. What would be talked about in the following paragraph?

A. How to teach history effectively.         

B. Some negative reasons for studying history.

C. How to get more people to study history.  

D. Some bad historical figures.

砌体沿通缝截面抗剪强度等于该测点的（）与该测定的（）的比值。

负荷是按星形连接，还是三角连接，是根据（）。

A、电源的接法而定

B、电源的额定电压而定

C、负荷所需电流大小而定

D、电源电压大小、负荷额定电压大小而定

镗刀按切削刃的数量可分为（）。

A.单刃镗刀

B.双刃镗刀

C.多刃镗刀

D.整体镗刀

E.镶齿镗刀

F.镗刀片