请根据要求用化学式填空: (1)2个硫酸根离子_____________;3个氨

题型:填空题

问题:

请根据要求用化学式填空:

(1)2个硫酸根离子_____________;3个氨分子_____________。

(2)某阳离子核外电子排布与氖原子相同,带2个单位的正电荷,则离子符号为______。

考点:离子符号的意义及写法化学式的写法和意义
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依照施工合同示范文本通用条款的规定,如果施工任务没有在合同约定的期限内完成,则迟延履行合同期间发生的风险事件,( )。

A.不免除迟延履行方的相应责任

B.双方的风险责任均不免除

C.如果是发包人办理的工程险,承包人获得工期顺延时,发包人应办理保险的延续手续

D.如果是发包人办理的工程险,因承包人原因不能按期竣工,承包人自费办理保险的延续手续

E.保险公司的赔偿不能弥补损失,由发包人和承包人平均分担

题型:填空题

岩爆

题型:填空题

船舶燃油舱柜的透气管的作用是()。

A.透气管还可做为测量管用

B.透气管的金属网除透气外还防止杂物落入

C.透气管的金属网除透气外主要起防火作用

D.透气管的金属网除起防火作用外还防止杂物落入

题型:填空题

阅读理解。

     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 why we are and

where we are without history, much less (更不必说) 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 (录音机) 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.

if, 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. 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.

4. The main purpose of this passage is to _______.

A. inspire the parents to teach their children history

B. show the importance of history in politics

C. explain the reasons why children study history

D. introduce the writer' s own way of teaching history

题型:填空题

“知觉完形”运用格式塔心理学原理解释艺术和审美现象的审美心理学学说,这一概念最早由奥地利哲学家()在其著名论文《()》中提出;“格式塔”作为一个心理学派别,其创始人是德国的()

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