物质保存的方法取决其性质.下列药品不需要密封保存的是[ ]
A.氢氧化钠
B.浓硫酸
C.氯化钠
D.浓盐酸
答案:C
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) .
A.fixed
B.flexible
C.stable
D.stateless
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