【单选题】You are managing an Oracle Database 11g database. You want to take a backup on tape drives of the USERS tablespace that has a single data file of 900 MB. You have tape drives of 300 MB each. To accomp...
A.
The SBT channel must be configured, with the MAXPIECESIZE set to 300 mb.
B.
The SBT channel must be configured, with the parallelism setting for the SBT devices set to 3.
C.
The COMPATIBLE initialization parameter for the database instance must be set to at least 10.0.
D.
The SBT channel must be configured, with the default parallelism setting for the SBT devices set to 1
【多选题】Given the above diagram and assuming that STP is enabled on all switch devices, which two statements are true?()
A.
DSW11 will be elected the root bridge.
B.
DSW12 will be elected the root bridge.
C.
ASW13 will be elected the root bridge.
D.
P3/1 will be elected the nondesignated port.
E.
P2/2 will be elected the nondesignated port.
F.
P3/2 will be elected the nondesignated port.
【判断题】Devices that are portable, but used while stationary, are sometimes removed from the group of mobile computing devices.
【简答题】城市用地平衡 prefix="o" ns="urn:schemas-microsoft-com:office:office" ?xml:namespace>
【多选题】关于图示正反转控制电路,以下说法正确的是
A.
左图所示的正反转电路,由正转变成反转时,必须先按停止按钮SB1
B.
左图所示的正反转电路,由正转变成反转时,可以不用先按停止按钮SB1
C.
右图所示的正反转电路,反向起动时不必使用停止按钮过渡而直接进行正反转控制
D.
右图所示的正反转电路,反向起动时必须使用停止按钮过渡进行正反转控制
【单选题】电路如图所示,其中U>0,I<0,关于此电路说法正确的是:( )
【多选题】关于图示正反转控制电路,以下说法正确的是
A.
mg src="http://p.ananas.chaoxing.com/star3/origin/dec36fd52cdc0d6841350ab611504111.jpg">
B.
左图所示的正反转电路,由正转变成反转时,必须先按停止按钮SB1
C.
左图所示的正反转电路,由正转变成反转时,可以不用先按停止按钮SB1
D.
右图所示的正反转电路,反向起动时不必使用停止按钮过渡而直接进行正反转控制
E.
右图所示的正反转电路,反向起动时必须使用停止按钮过渡进行正反转控制
【多选题】关于图示的比例微分电路,说法正确的是
B.
R3越小,越接近理想的比例微分环节。不可能做出理想微分,因为R3不可能为0。