牛顿对于开普勒定律的解释属于问题种类中的优化措施。
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Your multitenant container database (CDB) contains a pluggable database, HR_PDB. The default permanent tablespace in HR_PDB is USERDATA. The container database (CDB) is open and you connect RMAN. You want to issue the following RMAN command: RMAN > BACKUP TABLESPACE hr_pdb:userdata; Which task should you perform before issuing the command?()
A. Place the root container in ARHCHIVELOG mode.
B. Take the user data tablespace offline.
C. Place the root container in the nomount stage.
D. Ensure that HR_PDB is open.
区间设置地面通过信号机的高速铁路,TCC应实现对信号机的()
为防止火灾和保护货品角度而言,()情况对惰性气体统一纯度要求高。
A. 前者
B. 后者