A:国债到期必须还本付息
B:国债不存在任何风险
C:国债安全性强且收益率较高
D:国债可以随时还本结息
I feel strongly that each of us has a part ____ ____ in making China more powerful.
已知 a=0.00⋯0125︸2008个 b=0.000⋯08︸2008个 ,求a×b和a÷b的值。