非可摘局部义齿的适应证是（）。 A.年老体弱者 B.严重痴呆症患者 C.唇腭裂患者

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

一堆圆锥形黄沙，底面直径4米，高1.5米．按每立方米黄沙重1.7吨计算，这堆黄沙大约重多少吨？

We have to __________ some practical measures to solve the problem.   [ ]

A. come out  

B. come up with

C. come up  

D. come about

以下哪项不是早产儿特点（）

A.体重在2500g以下

B.身长不足47cm

C.哭声响

D.耳壳发育软

E.足底纹少

琵琶有5根弦。