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【单选题】Every year television stations receive hundreds of complaints about the loudness of advertisements. However, federal rules forbid the practice of making ads louder than the programming. In addition, t...
A.
TV stations always operate at the highest sound levels
B.
their sound levels are kept around peak levels
C.
their sound levels are kept in the middle frequency ranges
D.
unlike regular programs their intensity of sound varies over a wide range
【单选题】关于可赎回债券的论述不正确的是（ ）。
A.
附有赎回权的债券的未来现金流量不能预知，增加了现金流的不确定性
B.
发行人可以在利率下降时赎回债券，投资者不得不以较低的市场利率进行再投资，由此蒙受再投资风险
C.
由于赎回价格的存在，附有赎回权的债券的潜在资本增值有限
D.
可赎回债券一般规定保护期，但在保护期内，发行人也可以行使赎回权