题目内容
物体只在某一个投影面上的投影为圆时，这样的物体适合选用正等轴测图表达。
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输入一行字符，将其中的小写字母转换为大写字母。#include "stdio.h"#include "string.h"int main(){char str[80];unsigned int i;printf("请输入一行文字：\n");gets(str);//读入字符串并存入各数组元素中去printf("\n转换前：");printf("%s",str);//注意这儿用的格式符为%s而不是%cprintf("\n转换后：");for(i=0;i<[请选择A];i++)//用strlen()函数获取字符串长度if((str[i]<='z')&&(str[i]>='a'))//若为小写字母则进行转换printf("%c",[请选择B]);//转换为对应大写字母并输出elseprintf("%c",[请选择C]); //不是小写字母，原样输出printf("\n\n");return 0;}
下面是中国部分城市名称列表（共137个城市名），请将其按字母表顺序排列生成一个有序表以方便查看。北京市，上海市，天津市，重庆市，香港特别行政区，澳门特别行政区，合肥市，毫州市，芜湖市，马鞍山市，池州市，黄山市，滁州市，安庆市，淮南市，淮北市，蚌埠市，巢湖市，宿州市，宣城市，六安市，阜阳市，铜陵市，明光市，天长市，宁国市，界首市，桐城市，福州市，厦门市，泉州市，漳州市，南平市，三明市，龙岩市，莆田市，宁德市，建瓯市，武夷山市，长乐市，福清市，晋江市，南安市，福安市，龙海市，邵武市，石狮市，福鼎市，建阳市，漳平市，永安市，兰州市，白银市，武威市，金昌市，平凉市，张掖市，嘉峪关市，酒泉市，庆阳市，定西市，陇南市，天水市，玉门市，临夏市，合作市，敦煌市，甘南州，南宁市，贺州市，玉林市，桂林市，柳州市，梧州市，北海市，钦州市，百色市，防城港市，贵港市，河池市，崇左市，来宾市，东兴市，桂平市，北流市，岑溪市，合山市，凭祥市，宜州市，贵阳市，安顺市，遵义市，六盘水市，兴义市，都匀市，凯里市，毕节市，清镇市，铜仁市，赤水市，仁怀市，福泉市，海口市，三亚市，万宁市，文昌市，儋州市，琼海市，东方市，五指山市，石家庄市，保定市，唐山市，邯郸市，邢台市，沧州市，衡水市，廊坊市，承德市，迁安市，鹿泉市，秦皇岛市，南宫市，任丘市，葉城市，辛集市，涿州市，定州市，晋州市，霸州市，黄骅市，遵化市，张家口市，沙河市，三河市，冀州市，武安市#include "stdio.h"#include "string.h"#define N 137int main(){//多定义一行，有效数据从1号行开始存放，初始化时给0号行赋空串//列数取15，因城市名最长为7个汉字， 14个字符，加上结束标志'\0'，共15个char str[N+1][15]={"","北京市","上海市","天津市","重庆市","香港特别行政区","澳门特别行政区","合肥市","毫州市","芜湖市","马鞍山市","池州市","黄山市","滁州市","安庆市","淮南市","淮北市","蚌埠市","巢湖市","宿州市","宣城市","六安市","阜阳市","铜陵市","明光市","天长市","宁国市","界首市","桐城市","福州市","厦门市","泉州市","漳州市","南平市","三明市","龙岩市","莆田市","宁德市","建瓯市","武夷山市","长乐市","福清市","晋江市","南安市","福安市","龙海市","邵武市","石狮市","福鼎市","建阳市","漳平市","永安市","兰州市","白银市","武威市","金昌市","平凉市","张掖市","嘉峪关市","酒泉市","庆阳市","定西市","陇南市","天水市","玉门市","临夏市","合作市","敦煌市","甘南州","南宁市","贺州市","玉林市","桂林市","柳州市","梧州市","北海市","钦州市","百色市","防城港市","贵港市","河池市","崇左市","来宾市","东兴市","桂平市","北流市","岑溪市","合山市","凭祥市","宜州市","贵阳市","安顺市","遵义市","六盘水市","兴义市","都匀市","凯里市","毕节市","清镇市","铜仁市","赤水市","仁怀市","福泉市","海口市","三亚市","万宁市","文昌市","儋州市","琼海市","东方市","五指山市","石家庄市","保定市","唐山市","邯郸市","邢台市","沧州市","衡水市","廊坊市","承德市","迁安市","鹿泉市","秦皇岛市","南宫市","任丘市","葉城市","辛集市","涿州市","定州市","晋州市","霸州市","黄骅市","遵化市","张家口市","沙河市","三河市","冀州市","武安市"};unsigned int i,j;for(j=1;j<=N-1;j++)for(i=j+1;i<=N;i++)if[请选择A]//j行与i行进行比较{//利用0号行实现j行与i行的交换strcpy(str[0],str[j]);//利用函数strcpy()实现字符串赋值[请选择B]请选择C]}printf("按字母顺序排列的结果如下：\n\n");for(i=1;i<=N;i++)//序号3位，右对齐，不足3位补前导0；城市名16位，左对齐printf("%03d:%-16s",i,str[i]);//%-16s表示占16位，左对齐printf("\n");return 0;}
下列材料属于憎水性材料的是（）。
下列材料构造属于多孔状的有()
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