【简答题】设A,B为两个事件,且已知概率P(B)=1/2,P(A+B)=2/3,若事件A,B相互独立,则概率P(A)=A. 1/3
【单选题】海关对于空运货物的清关操作流程中,出口清关流程包括( )。
【单选题】She put his ____ to lack of experience.
【判断题】在 SQL 所支持的数据库系统的三级模式结构中,视图属于内模式。
【简答题】任务型阅读。 In Thailand (泰国), there are many elephants. They are very useful. They can carry heavy things so they can help people do a lot of hard work.. And they are very clever. They can act and dance. S...
【单选题】By using their trunks, elephants can tell the shape of all object and ______ is rough or smooth, or hot or cold.
【单选题】下列哪些因素可能引起自差的改变? I 地磁异常;II.磁暴;III 装卸磁性矿物;IV修船