课程关系中的成绩字段的值域定为0-100,如某门课成绩输入105,将违背关系中的()完整性原则。
A、用户定义
B、属性
C、实体
D、参照
参考答案:A
In relation to employment law:
(c) Explain the consequences of creating a fixed term labour contract without there being a valid reason for doing so. (2 marks)
已知outfile 是一个输出流对象,要想将outfile 的文件指针定位到当前位置之前321字节处,正确的函数调用语句是______ 。
A.outfile.seekp (321, ios_ base:: cur);
B.outfile.seekp (321,ios_ base:: beg);
C.outfile.seekp (-321,ios_ base:: beg);
D.outfile.seekp (-321,ios_ base:: cur);