目前较通用的二氧化碳吸收剂为（）
A.钡石灰
B.钠石灰
C.钙石灰
D.镁石灰
E.钾石灰
参考答案：B
《合同法》规定，自债务人的行为发生之日起( )年内，债权人没有依法行使撤销权的，该撤销权消灭。
A．1
B．2
C．3
D．5
When computing the yield to maturity, the implicit reinvestment assumption is that the interest payments are reinvested at the:（）
A. prevailing yield to maturity at the time interest payments are received.
B. yield to maturity at the time of the investment.
C. current yield.
