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【单选题】
解决自然垄断的有效措施有（）A.
征税
B.
采取反垄断措施
C.
公共定价
D.
收费
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反馈参考答案：
举一反三
【单选题】红白血病可见
A.
PAS染色红系呈强阳性反应
B.
AS-DCE染色呈阳性
C.
ACP染色呈阳性，且不被L酒石酸抑制
D.
AS-DAE染色呈阳性，且被NaF抑制
E.
POX多呈阴性反应，PAS反应产物为红色粗颗粒状或块状，底色不红
【多选题】If the price elasticity of demand is zero, which TWO of the following are ture?
A.
Demand is perfectly inelastic.
B.
There is no change in price regardless of the quantity demanded.
C.
The demand curve is a horizontal straight line.
D.
There is no change in the quantity demanded, regardless of any change in price.
【单选题】— What do your parents do? — They ______ doctors. [ ]
A.
are all
B.
are both
C.
all are
D.
both are
【单选题】If the price are ______, we trust important business can materialize.
A.
in line
B.
in the line
C.
on line
D.
on the line
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