— _____

—Go down this street to the end.

A．Where are we now?

B．What are we doing at the market?

C．How can I get to the market?

D．Who can get to the market?

对于法律凭证问题尚未解决的电子文件、在技术环境变迁下难以维护真实性的电子文件必须实行双套归档。