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（四） 某城市公交企业拥有公交营运车辆1000辆，全市经营的公交线路长度为2100千米，其中有公共交通线路通过的街道长度为1500千米；该城市用地面积为40。平方千米；公交公司近期提出：在公共交通车辆既定的条件下，要通过优化线网密度不断提高城市居民的出行方便程度，使乘客步行距离不超过1/2站距。该城市乘客平均乘距为6千米，每条线路平均车辆数为12辆，车辆在营运线路上每完成一个周转所耗费的时间平均为60分钟。 在车辆既定的条件下提高线网密度的措施将会导致乘客______
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注意：下面出现的“考生文件夹”均为%USER%。 在考生文件夹中存有文件名为Java_1.java文件，请完善Java_1.java文件，并进行调试，使程序结果为 a b c d e f g h i 由于Java_1.java文件不完整，请在注释行“//*********Found*********”下一行语句的下画线地方填入正确内容，然后删除下划线，请勿删除注释行或其他已有语句内容。存盘时，文件必须存放在考生文件夹下，不得改变原有文件的文件名。 给定源程序: import Java.io.*; public class Java_1 public static void main(String[]args) char[]charArray=’a’,’b’,’c’,’d’,’e’,’f’,’g’,’h’,’i’; char c; try //*********Found********** DataOutputStream out=new______( new FileOutputStream("test.dat")); for(int i=0; i＜charArray length; i++) out.writeChar(charArray[i]); out.close(); DataInputStream in=new DataInputStream( //*********Found********** new FilelnputStream("______")); while(in.available()!=0) c=in.readChar(); System.out.print(c+""); System.out.println(); //*********Found********** in______(); catch(IOException e))
分析投保单关系模式属于第几范式，并简单说明原因。修改上述关系模式，以达至4NF。
请根据如下查询语句，回答问题(d)，(e)和(f)。SELECT客户号FROM订单，订单明细WHERE订单明细.订单号=订单.订单号AND产品号=’02’ AND数量＞10；(d) 上述查询语句的功能是什么请简要回答。(30个字以内)(e) 将上述查询语句转换成对应的关系代数表达式。(f) 上述SQL查询语句是否可以进一步优化如可以，给出优化后的SQL查询语句。
The desire to use language as a sign of national identityis a very natural one, and in result language has played a (1) ______prominent part in national moves. Men have often felt the (2) ______need to cultivate a given language to show that they aredistinctive from another race whose hegemony they resent. (3) ______At the time the United States split off from Britain, for (4) ______example, there were proposals that independence should belinguistically accepted by the use of a different language from (5) ______those of Britain. There was even one proposal that Americans (6) ______should adopt Hebrew. Others favoured the adoption ofGreek, though, as one man put it, things would certainly besimpler for Americans if they stuck on to English and made (7) ______the British learn Greek. At the end, as everyone knows, the (8) ______two countries adopted the practical and satisfactory solutionof carrying with the same language as before. (9) ______Since nearly two hundred years now, they have shown (10) ______the world that political independence and national identitycan be complete without sacrificing the enormous mutualadvantages of a common language. 7（）
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