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【判断题】
( )矩形片或电阻器其电阻体形状为螺纹形状。A.
正确
B.
错误
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举一反三
【单选题】用 HCl 标准溶液滴定碳酸盐混合碱液, V 1 为滴定到酚酞变化时耗 HCl 的体积, V 2 为从酚酞终点滴到甲基橙终点时耗 HCl 的体积。若混合液中所含 NaHCO 3 和 Na 2 CO 3 的浓度相等,则( )。
A.
V 1 = 2V 2
B.
V 1 = V 2
C.
2V 1 = V 2
D.
V 1 = 0
【单选题】News Report 2 4.
A.
They will not be welcomed by young people.
B.
They will not come into immediate effect.
C.
They will boost China's economic growth.
D.
They will help to popularize early marriage.
【单选题】(News report 2) 4.
A.
Fewer people are commuting.
B.
Gas consumption is soaring.
C.
Job growth is slowing down.
D.
Rush-hour traffic is worsening.
【单选题】(News report 2) 4.
A.
Show off photos they had taken abroad.
B.
Share photos of their children with their friends.
C.
Share their travel experiences on social media.
D.
Show off a costly item they had bought.
【单选题】用HCl标准溶液滴定碳酸盐混合碱液,V 1 为滴定到酚酞变化时所耗HCl的体积,V 2 为从酚酞终点滴到甲基橙终点时耗HCl的体积。若混合液中所含NaHCO 3 和Na 2 CO 3 的浓度(mo/L)相等,则( )。
A.
V 1 =2V 2
B.
V 1 =V 2
C.
2V 1 =V 2
D.
V 1 =0
【单选题】用 HCl 标准溶液滴定碳酸盐混合碱液。滴定至酚酞终点时耗去 酸 ,从酚酞终点滴定至甲基橙终点时耗去 HCl 溶液 。若混合液中所含的 和 的浓度相等 ,则 ( )
A.
V1=V2
B.
V1=2V2
C.
2V1=V2
D.
V1=0
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