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【单选题】
NaOH滴定H3PO4以酚酞为指示剂．终点时生成( )。（已知H3PO4的各级离解常数：Kal=6.9×10-3，Ka2 =6.2×10-8，Ka3=4.8×10-13） A．NaH2PO4 B．Na2HPO4 C．Na3PO4 D．NaH2PO4+Na2HPO4A.
NaH2PO4
B.
Na2HPO4
C.
Na3PO4
D.
NaH2PO4+Na2HPO4
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【简答题】Many people often say there is more stress in today's society than in years past. In fact, these people are comparing our lives with that of the cave man, who didn't have to worry about the stock mark...
【简答题】我国宪法规定了公民遵守宪法和法律的义务,还规定了若干具体义务,包括:一是保守国家秘密。二是爱护公共财产。三是__________。四是____________。五是尊重社会公德。
【多选题】我国宪法规定了公民遵守宪法和法律的义务,还规定了若干具体义务,包括()。
A.
保守国家秘密
B.
爱护公共财产,
C.
遵守劳动纪律,
D.
遵守公共秩序,
E.
尊重社会公德。
【单选题】Throughout history man has had to accept the fact that all living things must die, hut people now live longer than they used to. Yet, all【C1】______things still show the effect of aging, which will eve...
A.
living
B.
alive
C.
lively
D.
lovely
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