Originally introduced by Netscape Communications, (1) are a general mechanism which HTTP Server side applications, such as CGI (2) , can use to both store and retrieve information on the HTTP (2) side of the connection. Basically, Cookies can be used to compensate for the (4) nature of HTTP. The addition of a simple, persistent, client-side state significantly extends the capabilities of WWW-based (5) .

3（）

A.programs

B.applications

C.frameworks

D.constrains

对薄板焊接时，焊条应选用（），以保证焊件不易烧穿且易引弧。

A.E4303

B.E5015

C.5016

D.E4313