[{"data":1,"prerenderedAt":-1},["ShallowReactive",2],{"$fP3hYynN_6Y2Ceiejb8-ilTit7tLRGAx5AoCOPcGmSDg":3},{"answer":4,"createTime":5,"id":6,"options":7,"origin":8,"question":15,"related":16,"source":27,"type":104},[],"2025-11-30 06:16:37",245470581,[],{"count":9,"courseId":10,"courseImg":11,"courseName":12,"workId":13,"workName":14},18,"53e1d2ef4961cca8eea3e23969ad2cb9","https:\u002F\u002Ftihai-oss-cloud.itihey.com\u002Fimg\u002F03a579384a6dc297c89809b582fcc767.png","默认课程","6b08672e1ee345dcba730aef1fbf5e55","字符串章节自测","以下代码中,str的值是:____ ```csharp intnum=100; stringstr=String.Format("数值是{0}",num); ```",[17,29,38,47,56,65,74,83,92,101],{"answer":18,"createTime":19,"id":20,"options":21,"question":26,"source":27,"type":28},[],"2025-11-30 06:10:57",245469474,[22,23,24,25],"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":30,"createTime":19,"id":31,"options":32,"question":37,"source":27,"type":28},[],245469475,[33,34,35,36],"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":39,"createTime":19,"id":40,"options":41,"question":46,"source":27,"type":28},[],245469476,[42,43,44,45],"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":48,"createTime":19,"id":49,"options":50,"question":55,"source":27,"type":28},[],245469477,[51,52,53,54],"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":57,"createTime":19,"id":58,"options":59,"question":64,"source":27,"type":28},[],245469478,[60,61,62,63],"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":66,"createTime":19,"id":67,"options":68,"question":72,"source":27,"type":73},[],245469479,[69,70,70,71],"AppleBananaCherry","Apple,Banana,Cherry",",Apple,Banana,Cherry","执行以下代码后,变量result的值是? ```csharp string[]arr={"Apple","Banana","Cherry"}; stringresult=String.Join(",",arr); ```",0,{"answer":75,"createTime":19,"id":76,"options":77,"question":82,"source":27,"type":73},[],245469480,[78,79,80,81],"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":84,"createTime":19,"id":85,"options":86,"question":91,"source":27,"type":73},[],245469481,[87,88,89,90],"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":93,"createTime":19,"id":94,"options":95,"question":100,"source":27,"type":73},[],245469482,[96,97,98,99],"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":102,"createTime":5,"id":6,"options":103,"question":15,"source":27,"type":104},[],[],2]