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【单选题】
使用双指示剂法测定混合碱中各组分的含量,先加入酚酞指示剂,HCl 标准溶液消耗的体积为 V1,再加入甲基橙指示剂,HCl 标准溶液消耗的体积为 V2。如果 V1 = V2,则样品中含有的组分是A.
只有 NaOH
B.
只有 Na2CO3
C.
NaOH 和 Na2CO3
D.
Na2CO3 和 NaHCO3
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举一反三
【单选题】Winners of speech competitions should exhibit all of the following aspects of English proficiency except__________.
A.
correct articulation
B.
use of slangs
C.
a strong vocabulary
D.
excellent pronunciation
【单选题】Winners of speech competitions are judged on their ability to use English as a __________ language in formulating and communicating their ideas.
A.
working
B.
foreign
C.
native
D.
functional
【简答题】Winners Club You choose to be a winner！ The Winners Club is a bank account specially designed for agers. It has been made to help you better manage your money. The Winners Club is a transaction ac...
【简答题】阅读理解 Winners Club You choose to be a winner! The Winners Club is a bank account specially designed for agers. It has been made to help you better manage your money. The Winners Club is a transacti...
【简答题】Winners Club You choose to be a winner! The Winners Club is a bank account specially designed for agers．It has been made to help you better manage your money．The Winners Club is a transaction acco...
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