小王在家里主动帮妈妈做力所能及的家务；在学校努力学习，认真完成学习任务；在社会上

一位中年男性自述排尿困难、尿急、尿痛、尿频，有婚外性行为。 * * 分泌物呈黄色脓性，量多，将其涂片镜检可见脓细胞内有革兰阴性双球菌。引起疾病的细菌是()

A．脑膜炎奈瑟菌

B．淋病奈瑟菌

C．葡萄球菌

D．链球菌

E．肺炎链球菌

[背景资料]

某公司(甲方)与某建筑公司(乙方)订立了基础施工合同，同时又与丙方订立了工程降水合同，基础施工合同约定采用综合单价承包。该基础工程施工网络计划示意图，如下图所示(单位：d)。

甲乙双方约定2008年6月15日开工，在工程施工中发生了如下事件。

事件一：由于降水施工方(丙方)原因，致使工作J推迟了2d．

事件二：2008年6月21日至6月22日，整个施工现场停电速成停工2d。

事件三：因设计变更，工作B土方工程量由300m³增至350m³，工作持续时间增加1d，该工作综合单价为50元/m³。

[问题]

乙方可以提出工期索赔要求的事件是哪些请简述理由。

阅读理解。

     Economics has long been known as an unpleasant science. But is any economist so dull as

to criticize Christmas? At first glance, the holiday season in western economies seems a treat

for those who are concerned with such things as GDP growth. After all, everyone is spending;

in America, sellers make 25 % of their yearly sales and 60 % of their profits between Thanksgiving

and Christmas. Even so, economists find something to worry about in the nature of the purchases

being made.

     Much of the holiday spending is on gifts for others. At the simplest level, giving gifts involves

the giver's thinking of something that the receiver would like - he tries to guess her preferences,

as economists say - and then buying the gift and delivering it. Yet this guessing of preferences is

often done badly. Every year, ties go unworn and books unread. And even if a gift is enjoyed, it

may not be what the receiver would have bought if they had spent the money themselves.

     Interested in this mismatch between wants and gifts, in 1993 Joel Waldfogel, then an economist

at Yale University, attempted to estimate the disparity(差距) in dollar terms. He asked students

two questions at the end of a holiday season: first, estimate the total amount paid (by the givers)

for all the holiday gifts you received; second, apart from the emotional value of the items, if you

did not have them, how much would you be willing to pay to get them? His results were unpleasant:

on average, a gift was valued by the receiver well below the price paid by the giver.

     The most conservative(保守的) estimate put the average receiver's valuation at 90% of the

buying price. The missing 10% is what economists call a deadweight loss(无谓损失)because it's

a waste of resources that could be avoided without making anyone poorer. In other words, if the

giver gave the cash value of the purchase instead of the gift itself, the receiver could then buy what

he/she really wants and be better off for no extra cost. It suggests that in America, where givers

spend $40 billion on Christmas gifts, $ 4 billion is being lost annually in the process of gift giving.

Add in birthdays, weddings and non Christian occasions, and the figure would balloon. So should

economists call for an end to gift giving, or at least press for money to become the gift of choice?

1. Why do some people regard the holiday season in western economies a treat?

A. Because the economic situation in US has been depressing.

B. Because American sellers make a quarter of their yearly sales through holiday seasons.

C. Because holiday spending can speed up GDP growth.

D. Because sellers can make as much profit as 60 % every holiday season.

2. What's the main idea for the second paragraph?

A. In many cases the gifts cannot meet the receivers' needs.

B. The purchases made over holiday season are actually a waste of money.

C. It's really not easy to guess the others' preferences.

D. Much of the holiday spending is on gifts for others.

3. The purpose of Joel Waldfogel's study is to _____.

A. prove the mismatch between wants and gifts

B. estimate the disparity (差距) between wants and gifts in economic terms

C. spark new ideas of economic studies on holiday spending

D. discover the exact cost of holiday spending on gift giving  

4. Economists think of the misusing 10% of holiday spending as a deadweight loss because_______.

A. the cash value of the purchase is lower than the buying price

B. it is actually a waste of resources in economic terms

C. with the money the givers can be better off for no extra cost

D. it makes many people even poorer for spending more on unwanted gifts

5. According to the passage altogether how much money is wasted every year on gift giving?

A. About $4 billion.

B. About 10% of the total value.

C. About $40 billion.  

D. Much more than $4 billion.

农民个人自繁、自用的常规种子有剩余的，可以在集贸市场上出售，串换，不需要办理（）。

Aboard a vessel，multiplying a load’s weight by the distance of the load’s center of gravity from the centerline results in the load’s（）.

A.TCG

B.transverse moment

C.righting moment

D.transverse free surface moment