(x+3)与(2x-m)的积中不含x的一次项,则m=______.

题型:填空题

问题:

(x+3)与(2x-m)的积中不含x的一次项,则m=______.

考点:多项式
题型:填空题

女性,20岁,自幼有轻伤后出血不止,伴有关节肿痛,反复鼻出血、牙龈出血1年余,常见皮肤黏膜出血点,自诉月经量过多。

具有诊断意义的检查是()

A.骨髓穿刺检查

B.血常规检查

C.血小板抗体检查

D.凝血因子检查

E.维生素K测定

题型:填空题

(10分)现有部分短周期元素的性质或原子结构如下表:

元素编号元素性质或原子结构
TM层上有2对成对电子
X基态原子核外电子共占据5个原子轨道且有2个未成对电子,
Y常温下单质为双原子分子,其氢化物水溶液呈碱性
Z元素最高正价是+7价
(1)元素T的原子最外层共有________种不同运动状态的电子。

(2) 元素Z与元素T相比,非金属性较强的是________(用元素符号表示),

(3)下列表述中能证明“元素Z与元素T相比,非金属性较强的”这一事实的是________。

a.常温下Z的单质和T的单质状态不同

b.Z的氢化物比T的氢化物稳定

c.一定条件下Z和T的单质都能与氢氧化钠溶液反应

(4)元素X和元素Y的第一电离能的大小关系为_________,请说明理由_______________。

(5)CO和Y2是等电子体,CO和Y2的结构均可表示为A≡B的形式(A、B可表示相同元素的原子也可表示不同元素的原子)。下表是两者的键能数据:(单位:kJ/mol)

 A-BA=BA≡B
CO357.7798.91071.9
Y2154.8418.4941.7
结合数据说明CO比Y2活泼的原因:______________________________________。

题型:填空题

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.

11()

A.internet

B.online

C.current

D.predominant

题型:填空题

()不是安全生产国家监察的内容

A.发布安全生产信息

B.安全技术

C.安全教育培训

D.职业病管理

题型:填空题

高空作业机械一般由()、安全保护装置等组成。

A、作业平台

B、液压系统

C、电气系统

D、操纵系统

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