可以保护内部网络不受来自外部网络攻击的设备是（）。 A.交换机 B.中继器 C.防火

通常白细胞减少，骨髓中异常原始细胞大量增殖并浸润各器官组织，见于（）。

A.特发性血小板减少性紫癜

B.再生障碍性贫血

C.缺铁性贫血

D.溶血性贫血

E.急性白血病

以下关于团体健康保险理赔的基本流程，正确的顺序是（ ）：①确定合格费用；②确定净赔付水平；③给付合格性和损失证明；④确定总给付水平。

A．①②③④

B．③①④②

C．③①②④

D． ①③②④

[背景资料]
某城市给水工程项目，通过招标投标确定了本市一家具有工程项目资质的施工企业承担该施工任务。
(1)施工企业在给水厂站工程施工时制订了以下施工技术要求。
①水池底板混凝土应分层分次浇筑完成。
②水池底板混凝土浇筑采用掺外加剂的泵送混凝土时，其坍落度不宜小于150mm。
③水池池壁混凝土应分层浇筑完成，每层混凝土的浇筑厚度不应超过40mm，沿池壁高度均匀摊铺。
(2)施工企业在开槽埋管施工时提出的部分技术要求如下所述。
①人工开挖基坑时的堆土高度不宜超过2m。
②管道基础槽深超过2m，基础浇筑时，必须采用串筒或滑槽来倾倒混凝土，以防混凝土发生离析现象。
③同一沟槽内有双排管道但基础底面的高程不同时，应先回填基础较高的沟槽。
施工企业在施工过程中特别注重给水结构工程施工的质量控制，制订了水下顶管施工方案等施工质量计划。
[问题]

水下顶管施工方案应包括的内容有哪些

(10分)某化学学习小组在实验室里利用下图装置测定中和反应中的热效应。实验时将溶液和未知浓度的NaOH溶液混合均匀后，测量并记录溶液温度，所得实验结果如右下图所示(实验中始终保持)。

据此请回答下列问题：

(1)从实验装置上看，左图中尚缺少的一种玻璃用品是________________________。

(2)保温杯的作用是_______________________________________________________。

(3)某同学根据所得数据，提出了以下观点，其中正确的是______________________。

A．做该实验时环境温度为22℃

B．该实验表明化学能可以转化为热能

C．该实验表明有水生成的反应都是放热反应

(4)利用图中所给数据，可测得NaOH溶液的浓度约为______________

(5)除了使用保温杯外，为了保证实验成功，还要注意哪些问题(说出1点即

可) ____________________________

Until the late 1940s, when television began finding its way into American homes, companies relied mainly on print and radio to promote their products and services. The advent of television (1) a revolution in product and service. Between 1949 and 1951, advertising on television grew 960 percent. Today the Internet is once again (2) promotion. By going online, companies can communicate instantly and directly with prospective customers. (3) on the World Wide Web includes advertising, sponsorships, and sales promotions (4) sweepstakes, contests, coupons, and rebates. In 1996 World Wide Web advertising revenues (5) $ 300 million.

Effective online marketers don’t (6) transfer hard-copy ads to cyberspace. (7) sites blend promotional and non-promotional information indirectly delivering the advertising messages. To (8) visits to their sites and to create and (9) customer loyalty, companies change information frequently and provide many opportunities for (10) .

A prototype for excellent (11) promotion is the Ragu Web site. Here visitors can find thirty-six pasta recipes, take Italian lessons, and view an Italian film festival, (12) they will find no traditional ads. (13) subtle is the mix of product and promotion that visitors hardly know an advertising message has been (14) . Sega of America, maker of computer games and hardware, uses its Web site for a (15) of different promotions, such as (16) new game characters to the public and supplying Web surfers the opportunity to (17) games. Sega’s home page averages 250,000 visits a day. To heighten interest in the site, Sega bought an advertising banner on Netscape (18) increasing site visits by 15 percent. Online (19) in Quaker Oats’ Gatorade promotion received a free T-shirt in exchange for answering a few questions. Quaker Oats reports that the online promotion created product (20) and helped the company know its customers better.

14（）

A.propagated

B.advertised

C.delivered

D.affected