【单选题】You have been assigned to manage a set of databases. The previous DBA did not leave you notes regarding the structure of each of the databases. While analyzing an instance, you notice that the system ...
A.
This instance is being used to manage the operating system files.
B.
This instance is being used to manage the files of other databases.
C.
This instance is being used to manage the instances of other databases.
D.
This instance is being used to manage the background processes of other instances.
【简答题】[A\] In contrast\[B\] In particular\[C\] For instance\[D\] As a result[A/] In contrast/[B/] In particular/[C/] For instance/[D/] As a result
【简答题】TYJL-II型联锁机每块采集板最多能够采集( )路信息。
【单选题】如下几类数中,不能直接用浮点数表示的是()。
【简答题】光在真空中传播速度______m/s.太阳与地球间距离1.5×10 11 m太阳发出的光到达地球时间大约______s.
【单选题】'For instance' means().
【简答题】已知光的速度为300000000米/秒,太阳光到达地球的时间大约是500秒,试计算太阳与地球的距离大约是多少千米?(结果用科学记数法表示)
【简答题】经过科学家的探测,太阳发出的电磁波大约要经过500 s的时间才能到达地面,请问太阳与地球之间的距离大约有多少千米?