Don’t try to persuade your boss；he won’t

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 HTTP. The addition of a simple, persistent, client-side state significantly extends the capabilities of WWW-based (25) .

21（）

A.Browsers 

B.Cookies 

C.Connections 

D.Scripts

姑息性术后食管癌放疗剂量为（）。

A.30Gy

B.40Gy

C.45Gy

D.50Gy

E.60Gy

我国采用的电话量化标准，是符合13折线律还是15折线律？

起重机的电阻器在使用中温升不宜超过（）℃。

A、100

B、200

C、300

D、400

E、500

F、600

G、700

H、800

I、900

J、1000

《黄河大合唱》的作曲家是（）

A.聂尔

B.冼星海

C.王惠然

D.汪立三