8 月 新增63题库：
01 which thre statements are true about unlugging a pluggable database(PDB)?
关于卸载可插拔数据库(PDB)，哪三句话是正确的?
A) an unplugged PDB can be plugged into the same or abother container database(CDB).
一个未插入的PDB可以插入到相同的或不同的容器数据库(CDB)中。
C) a pdb must have been opened at leasr once after creation.
一个pdb必须在创建后至少被打开过一次。
D) a pdb must be in closed state before it can be unplugged.
pdb必须在关闭状态下才能被拔下。
02 you plan to create a new pdb by copying pdb e e d . 你 计 划 通 过
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