变压器油老化后产生酸性、胶质和沉淀物,会()变压器内金属表面和绝缘材料。A.破坏 B

题型:单项选择题

问题:

变压器油老化后产生酸性、胶质和沉淀物,会()变压器内金属表面和绝缘材料。

A.破坏

B.腐蚀

C.强化

D.加强

考点:机械工程润滑油知识润滑油知识题库
题型:单项选择题

已知甲箱中只放有x个红球与y个白球(x,y≥0且x+y=6),乙箱中只放有2个红球、1个白球与1个黑球(球除颜色外,无其它区别).若甲箱从中任取2个球,从乙箱中任取1个球.

(Ⅰ)记取出的3个球的颜色全不相同的概率为P,求当P取得最大值时x,y的值;

(Ⅱ)当x=2时,求取出的3个球中红球个数ξ的期望E(ξ).

题型:单项选择题

阅读理解。

     Millions of Americans have been heading to the shops on Black Friday, a crucial event for US retailers. Many stores open their doors overnight, hoping to entice customers with cut-price bargains. Black Friday-the day after the Thanksgiving public holiday-is traditionally the start of the Christmas shopping season.

     Consumers are spending in an uncertain environment as fears about the health of the US economy

persist. Thousands of people queued late on Thursday evening in the hope of being the first to find a

bargain, with many shops offering deep discounts on clothing, electronic goods and toys.

     "Several chains opened even earlier than the typical midnight start. Children's retailer Toys R Us threw open its doors at 22:00 on Thursday for the first time. Others stayed open after trading on Thanksgiving

itself. Judging from the excitement at Toys R Us at 10 pm (on Thursday) and throughout the evening, the

shopper is back, " Toys R Us chief executive Jerry Storch told Reuters. Department store Macy's said it

had 7,000 shoppers outside its flagship Herald Square store in Manhattan in the early hours of Friday

morning, some 2,000 more than last year.

     Despite continued concerns over the US economy and a stubbornly high unemployment rate of 9.6%,

analysts are predicting a better holiday season than last year. The National Retail Federation says it expects sales to be 2.3% higher than 2009, to totalling $447m (285m). That could bode well for the US economy, with consumer spending making up about 70% of total economic output. "This is shaping up to be one

of the biggest Black Fridays we've seen," said David Bassuk, managing director at consulting firm Alix

Partners.

     Black Friday is so named because it is the day of the year when retailers traditionally hope to leave the "red" and enter the " black ", breaking even or making a profit.

1. What will happen after the Thanksgiving public holiday is over?

A. The white collars are feeling down.

B. The day will be black enough on Friday.

C. The fear of expenses will be caused.

D. The Christmas season is really coming.

2. What's the customers' hope during Christmas season?

A. To make a good deal with retailers.

B. To kill time by shopping overnight.

C. To buy more discounted things.

D. To enjoy the merry atmosphere.

3. What do most Americans concern about?

A. The worse situation which American economy is in.

B. The fear that they lose chance to buy cheaper clothes.

C. The profit that retailers will make during Christmas season.

D. The sale that is believed to be higher than last year.

4. What can be inferred from the fourth paragraph?

A. Americans are worried about inflation.

B. America's economy wouldn't inflation.

C. The sale this year is $ 447m higher than 2009.

D. Black Friday promises economic recovery.

5. What can we know from the last paragraph?

A. Black Friday got the name from a tale in history.

B. Black Friday often let most Americans down.

C. Black Friday drives most Americans crazy.

D. Black Friday is when retailers expect to make money.

题型:单项选择题

五行相克的关系中,怒"所胜"的情志是()

A.喜

B.思

C.悲

D.恐

E.惊

题型:单项选择题

下列基础类型中,属于柔性基础的是______基础。

A.砖
B.毛石
C.混凝土
D.钢筋混凝土

题型:单项选择题

甲在火车站帮助他人运送行李。一日,甲在帮乙运送行李时,因乙逃票,在出站口被盘问,甲遂乘乙不注意将行李提走。行李中有3000元现金,笔记本电脑一台,甲玩了几天,发现笔记本电脑中有丙公司的秘密资料,便将此资料打印出来,卖给与丙公司有竞争关系的丁公司。甲还在笔记本电脑中发现乙的信用卡帐号及密码,甲后来通过网上银行交易,花去2万余元。后甲怕被人发现,将此笔记本电脑抛人河中。请回答下面问题:

甲将3000元钱占为己有的行为,如何定性( )

A.盗窃罪

B.抢劫罪

C.抢夺罪

D.侵占罪

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