以下哪个选项是正确的json数据格式： A: { "id": 2, "userName": admin, "passWord": 12345, "email": admin@qq.com} B: { id: 2, userName: "admin", passWord: "12345", email: "admin@qq.com"} C: { "id": 2, "userName": "admin", "passWord": "12345", "email": "admin@qq.com",} D: { "id": 2, "userName": "admin", "passWord": "12345", "email": "admin@qq.com"}

要输出结果4*4=16，下列语句不正确的是( ) A: printf("4*4=16 "); B: printf("4*4=%d",16); C: printf("4*4=%d",4*4); D: printf("4*4=%d,16");

定义并初始化一个用于存放我们国家的四个直辖市的数组cityName，四个直辖市为：北京，上海，天津，重庆. 正确的是_________ A: String[] cityName=new String[4]{"北京","上海","天津","重庆"}; B: String[] cityName=new String[]{"北京","上海","天津","重庆"}; C: String[] cityName={"北京","上海","天津","重庆"}; D: String cityName = new String[4] { "北京", "上海", "天津", "重庆" };

下面判断正确的是（ ）。? char str[10]={"china"}; 等价于 char str[10]; str[]={"china";}|char c[4]="abc",d[4]="abc"; 等价于 char c[4]=d[4]="abc" ;|char *s="china"; 等价于 char *s; s="china" ;|char *a="china"; 等价于 char *a; *a="china" ;

int x = 3,y = 4;以下哪条输出语句正确？ A: Console.WriteLine("x={x},y={y}", x,y); B: Console.WriteLine("x={x},y={y}"); C: Console.WriteLine("x={0},y={1}", x,y); D: Console.WriteLine("x={1},y={2}", x,y);