阅读下列代码 - (NSString *)description { return [NSString stringWithFormat:@"%@", self]; } 下列关于程序执行结果的描述中,正确的是()。 A. 无输出结果 B. 程序陷入死循环 C. 循环引用 D. .无错误
手机使用
分享
复制链接
新浪微博
分享QQ
微信扫一扫
微信内点击右上角“…”即可分享
反馈
参考答案:
举一反三
【判断题】The McKinsey report pointed out that IoT may give a full play to the economic function, improve the productivity and competitiveness of enterprises and public sectors.
【简答题】实现“查询学生及其选课情况(基于左外连接)”的SELECT语句为( )。A. SELECT S.*, C.* FROM Student S JOIN SC ON S.Sno=SC.Sno B. SELECT S.*, C.* FROM Student S LEFT JOIN SC ON S.Sno=SC.Sno C. SELECT S.*, C.* FROM Student S, SC WHE...
【判断题】The McKinsey report pointed out that big data may give a full play to the economic function, improve the productivity and competitiveness of enterprises and public sectors.