[{"data":1,"prerenderedAt":-1},["ShallowReactive",2],{"$fv8grC4XO3s3hIn3WWzAMSBDrnnfgW41zYvDnDkqvR-g":3},{"answer":4,"createTime":5,"id":6,"options":7,"origin":11,"question":18,"related":19,"source":29,"type":70},[],"2025-11-30 06:10:57",245469479,[8,9,9,10],"AppleBananaCherry","Apple,Banana,Cherry",",Apple,Banana,Cherry",{"count":12,"courseId":13,"courseImg":14,"courseName":15,"workId":16,"workName":17},18,"53e1d2ef4961cca8eea3e23969ad2cb9","https:\u002F\u002Ftihai-oss-cloud.itihey.com\u002Fimg\u002F03a579384a6dc297c89809b582fcc767.png","默认课程","6b08672e1ee345dcba730aef1fbf5e55","字符串章节自测","执行以下代码后,变量result的值是? ```csharp string[]arr={"Apple","Banana","Cherry"}; stringresult=String.Join(",",arr); ```",[20,31,40,49,58,67,71,80,89,98],{"answer":21,"createTime":5,"id":22,"options":23,"question":28,"source":29,"type":30},[],245469474,[24,25,26,27],"字符串一旦创建就不能修改其内容","对字符串重新赋值时会创建新的字符串对象","字符串变量存储的是字符串数据的引用地址","字符串的方法都会返回新的字符串","以下关于字符串不可变性的说法,正确的有","v1",1,{"answer":32,"createTime":5,"id":33,"options":34,"question":39,"source":29,"type":30},[],245469475,[35,36,37,38],"通过字符串字面量赋值","使用string类的构造方法","使用+运算符连接字符串","使用String.Format方法","以下属于创建string对象的方法有",{"answer":41,"createTime":5,"id":42,"options":43,"question":48,"source":29,"type":30},[],245469476,[44,45,46,47],"strings="Hello"","strings=newstring(newchar[]{'H','e','l','l','o'})","strings=String.Concat("He","llo")","strings=newstring('H',5)","以下代码能正确创建字符串"Hello"的有",{"answer":50,"createTime":5,"id":51,"options":52,"question":57,"source":29,"type":30},[],245469477,[53,54,55,56],"String.Compare用于比较两个字符串的大小","String.Concat可以连接多个字符串","String.Join需要指定分隔符","String.Format可以将值转换为指定格式的字符串","以下关于string类静态方法的说法,正确的有",{"answer":59,"createTime":5,"id":60,"options":61,"question":66,"source":29,"type":30},[],245469478,[62,63,64,65],"Console.WriteLine(""+3)","Console.WriteLine(3+"")","Console.WriteLine(string.Format( {0} ,3))","Console.WriteLine(newstring('3',1))","以下代码的运行结果包含"3"的有",{"answer":68,"createTime":5,"id":6,"options":69,"question":18,"source":29,"type":70},[],[8,9,9,10],0,{"answer":72,"createTime":5,"id":73,"options":74,"question":79,"source":29,"type":70},[],245469480,[75,76,77,78],"Hi**","i**","H**","*i*","以下代码的运行结果是? ```csharp char[]arr={'H','i'}; strings1=newstring(arr,1,1); strings2=newstring('*',2); Console.WriteLine(s1+s2); ```",{"answer":81,"createTime":5,"id":82,"options":83,"question":88,"source":29,"type":70},[],245469481,[84,85,86,87],"小于0","等于0","大于0","不确定","使用string类的Compare方法比较字符串"abc"和"ABC",返回的结果是",{"answer":90,"createTime":5,"id":91,"options":92,"question":97,"source":29,"type":70},[],245469482,[93,94,95,96],"String.Concat方法只能连接两个字符串","String.Join方法可以指定分隔符连接字符串数组","字符串的Length属性返回的是字节数","String.Format方法不能格式化日期类型","以下关于string类方法的说法,正确的是",{"answer":99,"createTime":100,"id":101,"options":102,"question":103,"source":29,"type":104},[],"2025-11-30 06:16:37",245470581,[],"以下代码中,str的值是:____ ```csharp intnum=100; stringstr=String.Format("数值是{0}",num); ```",2]