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Identify three valid methods of opening, pluggable databases (PDBs).（）
A:ALTER PLUGGABLE DATABASE OPEN ALL ISSUED from the root
B:ALTER PLUGGABLE DATABASE OPEN ALL ISSUED from a pdb
C:ALTER PLUGGABLE DATABASE PDB OPEN issued from the seed
D:ALTER DATABASE PDB OPEN issued from the root
E:ALTER DATABASE OPEN issued from that pdb 
F:ALTER PLUGGABLE DATABASE PDB OPEN issued from another pdb
G:ALTER PLUGGABLE DATABASE OPEN issued from that pdb

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出自：Oracle认证

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