子痈的病因病机有 A．肝肾阴虚，阴虚火旺 B．湿热下注，经络阻隔 C．肝气郁结，肝火

以客户为中心，以市场为出发点，建立在“以销定产”的观念之上的营销观念是()。

A.生产观念

B.推销观念

C.市场营销观念

D.社会营销观念

E.产品观念

若关于x的方程x²+mx-m=0有两个相等的实数根，则m=______．

The War Against Sand

Imagine living on the edge of a vast desert, which is moving quietly closer to your village every day and covering your fields. The desert is on the move. This is called desertification.

Desertification occurs in regions close to an already existing desert.     71    The first is over-use of water in the area. There is not enough water in any case, and if it is not carefully used, disaster can follow. As time goes on, water shortages make farming more and more difficult. In some places, locals can remember local lakes and marshes which were once the homes for all kinds of fish and birds.     72    Farmers leave the land, and fields are replaced by deserts.

The second cause is misuse or over-use of the land.     73    Ploughing(耕) large fields and removing bushes and trees means that the wind will blow away the soil. Once the soil is lost, it is hard to replace, and if there is rain, it has nowhere to go, and brings no benefit.

    74    Every spring, the skies over some of eastern cities, thousands of kilometers away from the deserts, can be darkened by sandstorms. Dust from deserts can have a great effect on weather systems. While desertification is perhaps being partly caused by global warming, these sandstorms can make global warming worse by adding to what is known as the greenhouse effect.

What can be done to slow down or stop the process of desertification? A great deal of work is already under way. Obviously first steps are to find new water sources.     75    Some types of grass also hold the soil together, and stop the wind taking it. Without these efforts, it will be harder and harder to stop the world’s deserts in their tracks, and more and more farmers will give up and head for cities. The lesson to be learnt lies beneath the sand.

A．It generally arises from two related causes.

B．It is not only the farmers and villagers who suffer.

C．They have been completely buried by the sand now.

D．Scientists are doing the research on the cause of desertification.E. They destroy the land, as the soil dries out and is then blown away.

F. Tree planting can help, by providing barriers between desert and rich field.

G. This means that the wrong crops are planted, and need more water than is available.

出现厚度波动时的处理流程是（）

A.重新标定测厚仪

B.保存好厚度曲线

C.记录厚度波动位置和长度

D.钢卷上注明厚度超差字样

山地铁塔地面组装时，选料应（）搬运，不得强行拽拉。

A.由上往下

B.由下往上

C.抽取

D.随意