家用电器的三脚插头中有两个脚接用电部分，另一个脚跟用电器的 _________ 连接．与三脚插头对应的三孔插座中，除两个孔分别接火线和零线外，另一个孔是跟 _________ 相连接的．

Originally introduced by Netscape Communications, (71) are a general mechanism which HTTP Server side applications, such as CGI (72) , can use to both store and retrieve information on the HTTP (73) side of the connection. Basically, Cookies can be used to compensate for the (74) nature of HTTP. The addition of a simple, persistent, client-side state significantly extends the capabilities of WWW-based (75)

A．Client

B．Editor

C．Creator

D．Server