“忧者见之则忧，喜者见之则喜”是指（） A.悲哀 B.愤怒 C.情感 D.情操 E.

Originally introduced by Netscape Communications, (21) are a general mechanism which HTTP Server side applications, such as CGI (22) , can use to both store and retrieve information on the HTTP (23) side of the connection. Basically, Cookies can be used to compensate for the (24) nature of HTTR The addition of a simple, persistent, client-side state significantly extends the capabilities of WWW-based (25) .

A．fixed

B．flexible

C．stable

D．stateless

DBMS中实现事务持久性的子系统是______。

A．安全性管理子系统

B．完整性管理子系统

C．并发控制子系统

D．恢复管理子系统

高兴：成功

A．疲乏：工作

B．休息：旅游

C．梦想：贪婪

D．生气：疼痛

说明三角函数的BASIC表示法。

什么叫电动机左手定则？