测定下列哪些物理常数可以区别或检查药品的纯杂程度()。
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目录服务恢复模式可以在域中任何一台计算机上使用。
A. 正确
B. 错误
ZYJ7电液分动外锁闭道岔锁钩铜套磨损不得超过()
A. 1/2
B. 3/5
C. 3/4
D. 2/3
牛顿对于开普勒定律的解释属于问题种类中的优化措施。
A. 正确
B. 错误
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.