由于蒸汽的密度小，蒸汽因输送地形高度形成的静压力很小，所需的（）能小。 A.热 B.

若函数f（x）=e^x（x²+ax+3）在区间（0，3）内存在零点，则实数a的取值范围是______．

初产妇，足月临产10小时，破水7小时，宫缩20秒1（8~10）分，胎心180次／分，羊水Ⅱ度污染， * * 检查：宫口开大5cm，S=0，矢状缝在右斜径上，小囟门在7点处，坐骨棘突，坐骨切迹<2横指，骶骨浅弧。

应立即采取的措施为（）

A.严密观察产程，等待自然分娩

B.立即剖宫产

C.小剂量滴注催产素

D.持续吸氧

E.安定10mg静推

F.手法转胎位，产钳助产

按照净现值法，贷款价值的确定主要依据对未来( )的贴现值。

A．现金流入

B．现金流出

C．现金流量

D．净现金流量

治疗气虚型胎动不安的代表方剂是：（）

A.保阴煎

B.举元煎

C.加味圣愈汤

D.苎根汤

E.寿胎丸

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.

17（）

A.exchange

B.purchase

C.download

D.acquire