All the credit card organizations charge interest on a monthly basis which may()as 25 per cent a year, yet judicious purchasing using a card can mean that you obtain up to seven weeks interest-free credit.

A. come up

B. account for

C. add up

D. work out

( )是招标文件的核心文件，是投标人进行方案设计的指导性和纲领性文件。

A．投标须知

B．主要合同条件

C．设计条件

D．设计要求

E．投标文件格式