谁会这道题：阅读下列材料：
阅读下列材料：
材料1：中国古代的“选举”与源自西方、现在流行的“选举”虽然中文字面相同,在实质内容方面无疑是有着根本性的差别的.
——《布莱_百度作业帮
谁会这道题：阅读下列材料：
阅读下列材料：
材料1：中国古代的“选举”与源自西方、现在流行的“选举”虽然中文字面相同,在实质内容方面无疑是有着根本性的差别的.
——《布莱
谁会这道题：阅读下列材料：
阅读下列材料：
材料1：中国古代的“选举”与源自西方、现在流行的“选举”虽然中文字面相同,在实质内容方面无疑是有着根本性的差别的.
——《布莱克维尔政治学百科全书》
材料2：雅典人创立陶片放逐法的本意旨在防止一&些人由于权力过于膨胀而危及民主政体,但在以后的发展中逐渐演化为排斥“精英”或者“英雄”的工具,常常放逐有功之人.“主权在民”在后期演化为“暴民政治”,德才之人遭排斥,这种制约“强人”的有力武器中,也集中体现了原始民主制度的所有弊端.在这样的制度下,集体政治导致&集体平庸,把城邦推向了自我衰退的道路之中.
——《世界历史》
材料3：苏格拉底认为雅典民主政体的“根本缺陷,在于它不要求其领导者具有任何特殊的知识,它将社会的命运委之于缺乏真知灼见的人们的手中”.
——《雅典民主政治初探》
请回答：（1）材料1中“源自西方”的“选举”制度实示上是指雅典的什么制度?这种制度产生的主要原因是什么?________________________________________________________________________________________________________________________________________________________________ （2）据材料2,指出雅典这种制度带来了哪些影响?________________________________________________________________________________________________________________________________________________________________ （3）据材料3,它反映了雅典时期推行怎样的民主方式?并指出它给我们在当今的决策上有什么启示?________________________________________________________________________________________________________________________________________________________________ （4）结合所学知&识,运用“克利斯提尼改革”“&民主政治”“希腊文明”“断层”四个词语,以“雅典民主政治的影响”为主题写一则历史短文.（要求：①紧扣主题,观点合理；②史实准确,史论结合；③条理清晰,合乎逻辑；④字数在90字以内） ________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________
（1）制度：直接民主制度.主要原因：小国寡民的城邦特点. （2）直接民主不能保障公民个人权力（集体暴政）,容易成为政治斗争的工具,导致民主权力被滥用,使雅典逐渐走向衰退. （3）民主方式：抽签选举.启示：决策要实行民主集中制,以人为本；注意加强对参政人员的素质培养,增加决策的科学性. （4）通过克利斯提尼改革,确立了雅典民主政治；而雅典民主政治一方面开启了西方民主政治的先河,另一方面促进了希腊文明的繁荣发展；但雅典民主政治也隐含着社会动乱,使希腊文明形成断层.这个化学题 谁会啊 讲解一下_百度知道
这个化学题 谁会啊 讲解一下
请你设计配置方案（要求现有20g氯化钠质量分数为15％的盐水和15g氯化钠质量分数为40％的盐水：至少两种）。欲配制30g含盐20％的氯化钠溶液，另有足够的氯化钠和水，需要物质的质量是多少；并选其中一种进行计算
提问者采纳
在20g氯化钠质量分数为15％的盐水加入适量的氯化钠或水方案1，即，30g含盐20％的氯化钠溶液中所含的氯化钠为6g：用氯化钠和水重新配制30g含盐20％的氯化钠溶液。以方案3为例；方案3：在15g氯化钠质量分数为40％的盐水加入适量的氯化钠或水；方案2，即可配制得到30g含盐20％的氯化钠溶液：取氯化钠溶于24g水中
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（2）方案二，30g-20g-3g=7g，因此还差3g，y&lt，20g15％的盐水中氯化钠的质量为20g*15％=3g、3g氯化钠混合即可、氯化钠混合，只要是x&lt：15x%+40y%=30*20%。当然还有多种方法，这样就已经有无数个答案了，并且符合3x+8y=150的答案都正确：x+y=30。
设取15%的氯化钠的质量为x;15;20，解得3x+8y=150
这样的话，因此，因此
总质量关系。
30g20％的氯化钠溶液中氯化钠的质量为30g*20％=6个：取一定量15％的盐水和40％的盐水混合（1）方案一，溶质的质量关系，40％的盐水的质量为y：用20g15％的盐水和适量的水：用20g15％的盐水和7g水
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出门在外也不愁谁会这道题：阅读理解.
One cool April 22 morning,people started the day as usual.Yet it was not a normal day.What's so special about April 22?The answer is simple.It is Earth Day.People all over the world celebrated thi_百度作业帮
谁会这道题：阅读理解.
One cool April 22 morning,people started the day as usual.Yet it was not a normal day.What's so special about April 22?The answer is simple.It is Earth Day.People all over the world celebrated thi
谁会这道题：阅读理解.
&&&& One cool April 22 morning,people started the day as usual.Yet it was not a normal day.What's so special about April 22?The answer is simple.It is Earth Day.People all over the world celebrated this important day.The idea of having a special day to celebrate Earth began in the 1960s.Life was very different then.Few people talked or even thought about the environment.Most people had no idea how dirty our air and water were.&&&& On ApriI22,1970,twenty million Americans joined the first Earth Day activities.They showed that people really did want to do something about the environment.Since then laws have been passed to protect the air,water,land,and animals.&&&& The vehicles such as cars and buses you ride in must pass tests to make sure they don't cause too much pollution.Thanks to this law,cars today release ( 排放 ) about half as many bad chemicals as cars did back in 1970.As a result,the air we breathe is cleaner than it once was.Rivers and lakes are cleaner today than they were in the 1970s.It's a good thing because they needed a lot of help.The Cuyahoga River in Ohio was so polluted that rubbish and oil the river even caught fire!Today,the river is cleaner.It no longer burns.It's healthy enough for birds,fish,and other animals.Now the celebration has spread ( &传播 ) to other countries.More than 175 countries take part each year.&&&& In 2007 ,& People in China paid much attention to a big problem.&People were throwing away 27 million plastic bags a day!People had "Bye-Bye Throwaway Culture Week." They wanted everyone to see how polluted it was to throw away so many plastic bags.In 2008,China passed new laws against them.&&&& Every April22,millions get together to clean and protect Earth.They also celebrate how far we have come.Our job is to put this knowledge to work.You can help keep our planet healthy too!
根据短文内容回答下列各题.1.Is Earth Day on April 22?_________________________________________________ 2.What caught fire on the Cuyahoga River?_________________________________________________ 3.How many countries take part in the celebration each year now?_________________________________________________ 4.Why did Chinese people have "Bye-Bye Throwaway Culture Week"?_________________________________________________ 5.What are the purposes (目的) of celebrating the Earth Day?_________________________________________________
1.Yes,it is.&& 2.Rubbish and oil.&&&& 3.More than 175.4.Because they want everyone to stop throwing away plastic bags.&& 5.To help more people to realize the importance of protecting the earth and encourage people to take actions.(答案不唯一)推荐到广播
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