舌诊脏腑分部，一般认为舌根属（） A.肝胆 B.肾 C.脾胃 D.三焦 E.心肺

案情：2005年1月1日，甲与乙口头约定，甲承租乙的一套别墅，租期为五年，租金一次付清，交付租金后即可入住。洽谈时，乙告诉甲屋顶有漏水现象。为了尽快与女友丙结婚共同生活，甲对此未置可否，付清租金后与丙入住并办理了结婚登记。　　入住后不久别墅屋顶果然漏水，甲要求乙进行维修，乙认为在订立合同时已对漏水问题提前作了告知，甲当时并无异议，仍同意承租，故现在乙不应承担维修义务。于是，甲自购了一批瓦片，找到朋友开的丁装修公司免费维修。丁公司派工人更换了漏水的旧瓦片，同时按照甲的意思对别墅进行了较大装修。更换瓦片大约花了10天时间，装修则用了一个月，乙不知情。更换瓦片时，一名工人不慎摔伤，花去医药费数千元。　　2005年6月，由于新换瓦片质量问题，别墅屋顶出现大面积漏水，造成甲一万余元财产损失。　　2006年4月，甲遇车祸去世，丙回娘家居住。半年后丙返回别墅，发现戊已占用别墅。原来，2004年12月甲曾向戊借款10万元，并亲笔写了借条，借条中承诺在不能还款时该别墅由戊使用。在戊向乙出示了甲的亲笔承诺后，乙同意戊使用该别墅，将房屋的备用钥匙交付于戊。　　问题：

别墅维修及费用负担问题应如何处理？理由是什么？

Concrete is probably used more widely than any other substance except water, yet it remains largely unappreciated. "Some people view the 20th century as the atomic age, the space age, the computer age—but an argument can be made that it was the concrete age," says cement specialist Hendrik van Oss. "It’s a miracle material. " Indeed, more than a ton of concrete is produced each year for every man, woman and child on Earth. Yet concrete is generally ignored outside the engineering world, a victim of its own ubiquity and the industry’s conservative pace of development. Now, thanks to environmental pressures and entrepreneurial innovation, a new generation of concretes is emerging. This high-tech assortment of concrete confections promises to be per, lighter, and more environmentally friendly than ever before.
The concretes they will replace are, for the most part, p and durable, but with limitations. Concrete is sound under compression but weak under tension. Steel rebars are used as reinforcement, but make recycling difficult when concrete breaks down—and break down it inevitably will. Cracks caused by stress grow larger over time, with water forcing them open and corroding the rebars within. "When you put enough stress on it, concrete doesn’t work like we want it to. We’re asking too much of it now," says Mr. Van Oss. Concrete is also a climate-change villain. It is made by mixing water with an aggregate, such as sand or gravel, and cement. Cement is usually made by heating limestone and clay to over 2,500 degrees F. The resulting chemical reaction, along with fuel burned to heat the kiln, produces between 7 and 10 percent of global carbon-dioxide emissions.
"When we have to repeatedly regenerate these materials because they’re not durable, we release more emissions," says Victor Li, a civil and environmental engineering professor at the University of Michigan. Dr, Li has created a concrete suffused by synthetic fibers that make it per, more durable, and able to bend like a metal. Li’s creation does not require reinforcement, a property shared by other concretes that use chemical additives called plasticizers to reduce the amount of water in their composition. Using less water makes concrete per, but until the development of plasticizers, it also made concrete sticky, dry, and hard to handle, says Christian Meyer, a civil engineering professor at Columbia University.
"The engineer would specify a certain strength, a certain amount of water—and as soon as a supervisor turned his back, in would go a bucket of water," says Dr. Meyer of the time before plasticizers. Making per concretes, says Li, allows less to be used, reducing waste and giving architects more freedom. "You can have such futuristic designs if you don’t have to put rebar in there, or structural beams," says Van Oss. "You can have things shooting off into space at odd angles. Many possibilities are opened up." A more directly "green" concrete has been developed by the Australian company TecEco. They add magnesium to their cement, forming a porous concrete that actually scrubs carbon dioxide from the air.
"The planet’s been through several episodes of global warming before, and nature put carbon away as coal, petroleum, and carbonate sediments," says TecEco manager John Harrison. "Now we’re in charge, and we need to do the same. We can literally ’put away’ carbon in our own built environment." Another modification to the built environment is the carbon fiber-reinforced concrete of Deborah Chung, a materials scientist at the State University of New York at Buffalo. By running an electrical current through concrete, Dr. Chung says, tiny deformations caused by minute pressures can be detected. "You can monitor room occupancy in real-time, controlling lighting, ventilation, and cooling in relation to how many people are there," says Chung.
While experts agree that these new concrete will someday be widely used, the timetable is uncertain. Concrete companies are responsive to environmental concerns and are always looking to stretch the utility of their product, but the construction industry is slow to change. "When you start monkeying around with materials, the governing bodies, the building departments, are very cautions before they let you use an unproven material," Meyer says. In the next few decades, says Van Oss, building codes will change, opening the way for innovative materials. But while new concretes may be per and more durable, they are also more expensive—and whether the tendency of developers and the public to focus on short-term rather than long-term costs will also change is another matter.

The new "green" concrete has all the following advantages EXCEPT that ______.

A．it will require little reinforcement in preparation

B．it will become per lighter and climate-friendly

C．it will give architects and builders more freedom in designing and construction

D．it will greatly reduce the cost of production and construction

无面额股票的价值与公司净资产价值( )。

A．同方向变化

B．反方向变化

C．相等

D．无关

镜中月水中花是物质的表现。

YJ17卷烟机烟支传送装置上的（）通过负压吸风将V型导轨上的双倍长烟支吸住并传送。

A.拨烟轮

B.传送臂

C.吸风块

D.抽吸槽