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问题 单项选择题

混凝剂采用泵前投加方式的适用条件和设计要求不包括______。

A．药投于水泵吸水管或吸水井中吸水喇叭口处，利用水泵叶轮混合，取水泵房离水厂加药间较近时采用
B．适用于大型水厂
C．吸水管路和水泵进行防腐
D．应设防止空气进入吸水管措施，如设装有浮球阀的水封箱

答案

参考答案：B

单项选择题

亚急性细菌性心内膜炎并发脑出血的原因是（）

A.肝功能损害

B.凝血因子异常

C.血小板功能障碍

D.中毒性

E.感染性脑动脉瘤破裂
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单项选择题

Originally introduced by Netscape Communications, (71) are a general mechanism which HTTP Server side applications, such as CGI (72) , can use to both store and retrieve information on the HTTP (73) side of the connection. Basically, Cookies can be used to compensate for the (74) nature of HTTP. The addition of a simple, persistent, client-side state significantly extends the capabilities of WWW-based (75)

A．Browsers

B．Cookies

C．Connections

D．Scripts
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