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【单选题】
配制pH=5的缓冲溶液,用下列哪对缓冲对()A.
- (Ka2=6.3× )
B.
HAc-NaAc(Ka=1.76× )
C.
- (Ka2=5.6× )
D.
- (Kb=1.74× )
E.
- (Ka1=4.17× )
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举一反三
【单选题】Which of the following statements is true about the impact of an increase in the price of lettuce(生菜)?
A.
The demand for lettuce will decrease.
B.
The supply of lettuce will decrease.
C.
The equilibrium price and quantity of salad dressing(沙拉酱) will rise.
D.
The equilibrium price and quantity of salad dressing will fall.
E.
Both a and d are true.
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【单选题】“The lettuce was lonely without tomatoes and cucumbers for company”is an example of
A.
exaggeration．
B.
personification．
C.
understatement．
D.
synecdoche．
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