The market value or issue price of a bond is equal to the present value of all future cash payments provided by the bond.（）

A.吸水量小于2%大于0．2%，称微吸湿
B.吸水量小于0．2%为一般吸湿
C.吸水量大于5%为极易吸湿
D.吸水量小于2%，称微吸湿
E.．吸水量大于2%，称一般吸湿

A.0
B.1
C.2
D.λ