题目内容
设事务T1和T2,对数据库中地数据A进行操作,可能有如下几种情况,请问哪一种不会发生冲突操作( )。
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1) The past 20 years have seen little changes in the lives and structure of families in Britain. ____
2) The large rise in divorces has meant many women need to work to support themselves and their children. ____
3) In the past, men were considered as the breadwinner of the family. ____
4) The changes of the family have had a totally negative effect on the society. ____
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