【单选题】假设emp表包含一个婚姻状况的字段,则应该在该字段上创建( )索引。
【单选题】When a firm makes zero economic profit, it means that:
A.
the firm is covering implicit costs alone.
B.
the firm is covering the total opportunity costs of its resources.
C.
the firm is covering explicit costs alone.
D.
the firm is running at an accounting loss.
【简答题】下列关于设计求职申请表时需要注意事项的表述错误的是( )。
【简答题】_____________occurs when a firm invests resources in business activities outside its home country.
【单选题】在以下关于求职申请表的论述中,不正确的是()