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【单选题】
Before a Flashback Table operation, you execute the following command: ALTER TABLE employees ENABLE ROW MOVEMENT; Why would you need this to be executed?（）A.
Because row IDs may change during the flashback operation
B.
Because the object number changes after the flashback operation
C.
Because the rows are retrieved from the recycle bin during the flashback operation
D.
Because the table is moved forward and back to a temporary during the flashback operation
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举一反三
【单选题】对配位聚合的发现做出贡献并因此而获得 Nobel 化学奖的是 ________ 。
A.
Flory
B.
Ziegler-Natta
C.
Staudinger
D.
Carothers
【单选题】下列物品中,那个是藏族同胞眼中最珍贵的礼物()。
A.
藏族居民的主食为糌粑，喜饮酥油茶
B.
牧民以牛、羊肉为主食，僧尼不可食肉
C.
藏族居民主食为大米，辅以青稞
D.
藏民多食面食，饮舒油茶