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【单选题】
下列多元酸中(0.1mol/L)能用NaOH标准溶液分步滴定测定出各级H + 浓度的是( )。A.
草酸(K a1 =5.4×10 - 2 ,K a2 = 6.4× 10 - 5 )
B.
琥珀酸(K a1 =6.4×10 -5 ,K a2 =2.7×10 -6 )
C.
枸缘酸(K a1 =8.7×10 -4 ,K a2 =1.8×10 -5 ,K a3 =4.0×10 -6 )
D.
顺丁烯二酸(K a1 =1.5×10 -2 ,K a2 =8.5×10 -7 )
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【简答题】区域优势的类型有哪些
【单选题】Which of the following statements is false about the relationship of causes, problems and effects?
A.
Most often causes exist before the problem.
B.
Effects tend to occur after the problem has arisen.
C.
Effects of an event can be the causes of another event.
D.
Causes of an event cannot be the effects of another event.
【多选题】Which of the following statements are true about the relationship of causes, problems and effects?
A.
Most often causes exist before the problem.
B.
Effects tend to occur after the problem has arisen.
C.
Effects of an event can be the causes of another event.
D.
Causes of an event cannot be the effects of another event.
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