人的平常思想活动大部分是无需骚乱的，是能力的浪费。呼吸法可以打破原有的骚乱，消除计提不安定的因素，停止性循环的的运动。
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Your multitenant container database has three pluggable databases (PDBs): PDB1, PDB2, and PDB3.Which two RMAN commands may be; used to back up only the PDB1 pluggable database?（）
A. BACKUP PLUGGABLE DATABASE PDB1 while connected to the root container
BACKUP PLUGGABLE DATABASE PDB1 while connected to the PDB1 container
C. BACKUP DATABASE while connected to the PDB1 container
D. BACKUP DATABASE while connected to the boot container
E. BACKUP PLUGGABLE database PDB1 while connected to PDB2
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