管线边界层处的流体由于（）的存在使其流动受影响。 A.固体壁面 B.温度 C.压力

Since the first Earth Day started on April 22, 1970, people around the world have been encouraged to protect the environment and natural resources．Gaylord Nelson started this holiday．On the first Earth Day， 20 million people took part in Earth Day events．

Earth Day activities can include learning something about technology like cars that are more environmentally friendly and special houses that save energy and water．An organization called the Earth Day Network encourages people to use clean energy which doesn’t pollute the environment．Most of our energy comes from fossil fuels (化石燃料) that are found underground． Coal， oil and natural gas are examples of fossil fuels．Fossil fuels come from plants and animals that lived millions of years ago． Burning fossil fuels to create energy pollutes the air and water． Many scientists think that burning fossil fuels also increases the temperature of the earth． To reduce the use of fossil fuels． scientists are experimenting with hydrogen-powered (氢化发动的) cars． These cars don’t pollute the air like gas-powered cars．

Some scientists guess that by 2025, fossil fuels will run out．When people can no longer use gasoline， they may use fuel cells instead． Fuel cells use hydrogen to create energy． People do not need to worry about hydrogen running out， because it is renewable and replaceable．

In Washington， D.C.， a few people drive cars that run on fuel cells． When these cars need more energy, drivers can go to a hydrogen pump．The first hydrogen pump for the public opened in November 2004， marking an important step toward a cleaner environment．

小题1:what can we learn from the passage?

A．Fossil fuels don’t pollute the air．

B．Hydrogen-powered cars make less pollution．

C．Many drivers are driving hydrogen-powered cars．

D．We can find many hydrogen pumps in the USA．

小题2:How long may people still be able to use fossil fuels?

A．Twenty years．

B．Over thirty-eight years．

C．More than ten years．

D．About seventeen years．小题3:Which of the following is not mentioned?

A．Scientists are producing more hydrogen-powered cars．

B．Some people drive fuel-cell cars in Washington．

C．Fossil fuels come from plants and animals．

D．We can learn about environmentally friendly technology from Earth Day activities．小题4:When do fossil fuels pollute the air?

A．When we use them to create gasoline．

B．When people get them from the underground．

C．After being burned to get energy．

D．After getting them from a hydrogen pump．小题5:Because hydrogen is renewable， we don’t need to worry that ________．

A．it will be used up

B．it can be used for creating energy

C．it will pollute the environment

D．it will be cleaner

（）是医院社会工作环境中节奏最快、问题最集中的地方。

A.慢性疾病室

B.重症病患室

C.急诊室

D.妇产科

某国有工业企业2005年取得销售货物的收入1200万元，在扣除了成本、费用、税金和损失以后，企业实现利润200万元，并据此申报纳税。经税务机关审查发现以下情况：
(1)企业列支的借款利息支出总额为95万元，其中：建造的固定资产竣工决算投产后发生的贷款利息支出为65万元，对外投资借款的利息支出30万元，借款本金400万元，银行同期同类贷款利率为6%；
(2)上年度的“三新”研究开发费用为42万元，本年度的“三新”研究开发费用为55万元(其中国家财政补贴10万元)，已计入费用，企业并按国家的优惠政策计算了当期的附加费用扣除额；
(3)年底，新建一条生产线并投入试运行，其间取得产品销售收入50万元(不含增值税)，产品销售成本35万元，已冲减工程成本；
(4)签订财产转让合同转售不需用的房屋一幢，账面原值1000万元，已提折旧400万元，转让收入800万元，转让时支付土地使用权金额 100万元，原土地开发成本500万元，房地产开发费用80万元；
(5)销售费用中有本年业务宣传费4万元，上年未扣除完的业务宣传费2万元。
要求：按下列顺序回答公司予以补税所涉及的内容：
(1)借款利息支出应调整的应纳税所得额。
(2)“三新”研究开发费用应调整的应纳税所得额。
(3)试运行产品收入应调整的应纳税所得额。
(4)转售不需用的房屋应调整的应纳税所得额。
(5)业务宣传费应调整的应纳税所得额。
(6)计算企业当年应纳的企业所得税(企业所得税税率33%)。

大学生就业的环境是不断变化的，从政策到经济形势，从用人单位到毕业生自身，每年都有新的变化，大学生要充分利用积极的环境因素，实现就业。当前看来，大学生就业的积极因素有（）

A.国家出台的各种鼓励毕业生就业的新政策

B.用人单位用人观念的转变

C.严峻的就业形势已经促使学校改革教学模式、加强实践环节、重视就业指导、拓宽就业渠道

D.以上都是

感染猪传染性胃肠炎后，死亡率最高得猪是（）阶段的猪。

A.10日龄以内的猪

B.青年猪

C.育肥猪

D.怀孕母猪