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【单选题】
The Coase theorem suggests that private markets may not beable to solve the problem of externalitiesA.
if the government does not become involved in the process.
B.
when the number of interested parties is large and bargaining costs are high.
C.
if the firm in the market is a monopoly.
D.
if some people benefit from the externality.
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A.
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低压断路器
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【单选题】If a 7.25% coupon bond is trading for $982.00, it has a current yield of ____________ percent.
A.
7.38
B.
6.53
C.
7.25
D.
8.53
E.
7.18
【单选题】（）不但能用于正常工作时不频繁接通和断开的电路，当电路发生过载、短路或失压等故障时，能自动切断电路，有效地保护串接在它后面的电气设备。
A.
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【单选题】The coupon yield of a bond______.
A.
is expressed as a percentage of the par value of the bond
B.
is the same as the current yield
C.
changes when current interest rates change
D.
changes only when the market price of the bond changes
【单选题】( )不但能用于正常工作时不频繁接通和断开的电路，而且当电路发生过载、短路或失压等故障时，能自动切断电路，有效地保护串接在它后面的电气设备。
A.
刀开关
B.
低压断路器 c.组合开关
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