【单选题】(6分)(2012?重庆)向10mL 0.1mol?L ﹣1 NH 4 Al(SO 4 ) 2 溶液中,滴加等浓度Ba(OH) 2 溶液x mL.下列叙述正确的是( )
A.
x=10时,溶液中有 、Al 3+ 、 ,且c( )>c(Al 3+ )
B.
x=10时,溶液中有 、 、 ,且c( )>c( )
C.
x=30时,溶液中有Ba 2+ 、 、OH ﹣ ,且c(OH ﹣ )<c( )
D.
x=30时,溶液中有Ba 2+ 、Al 3+ 、OH ﹣ ,且c(OH ﹣ )=c(Ba 2+ )
【单选题】查看OSPF区域ABR、ASBR的信息,可以使用()
C.
Display ospf interface
【单选题】在画印制电路板图时,编辑元器件封装属性中,那一项为元器件所在板层?
【单选题】Which statement about OSPF ASBR summary LSA is true?()
A.
It is generated by an ASBR and indicates the reachability to an ABR located in another area.
B.
It is generated by ABR and indicates the reachability to an ASBR located in another AS.
C.
It is generated by ABR and indicates reachability to itself.
D.
It is generated by ABR and indicates the reachability to an ASBR located in another area.
E.
It is generated by ASBR and indicates the reachability to an ABR.
【单选题】同学们查阅资料得知,60个N原子可以结合成一个N 60 分子.下列叙述正确的是( )
【单选题】在OSPF中,关于ABR和ASBR论述不正确的有()
A.
ABR只负责传递区域内的路由,ASBR只负责传递AS外的路由
【单选题】向10mL 0.1mol?L -1 NH 4 Al(SO 4 ) 2 溶液中,滴加等浓度Ba(OH) 2 溶液x mL.下列叙述正确的是( )
A.
x=10时,溶液中有 NH +4 、Al 3+ 、 SO 2-4 ,且c( NH +4 )>c(Al 3+ )
B.
x=10时,溶液中有 NH +4 、 AlO -2 、 SO 2-4 ,且c( NH +4 )>c( SO 2-4 )
C.
x=30时,溶液中有Ba 2+ 、 AlO -2 、OH - ,且c(OH - )<c( AlO -2 )
D.
x=30时,溶液中有Ba 2+ 、Al 3+ 、OH - ,且c(OH - )=c(Ba 2+ )
【简答题】阻值为1M的五环电阻,误差为1%,写出五环的颜色