数字地图的数据文件夹一般分为Heights（高度），vector（矢量），clutter（地物），building（建筑），其中说法正确的是：（）

A:heights文件夹中的数字地形高度数据可以为二进制格式或ASCII文本格式存储的栅格数据格式，象元数据为高程值。 B:clutter文件中的Index.txt文件必须和地物数据存储在同一个目录中。 C:vector文件夹中包含了诸如公路、铁路、海岸线等这样一些地形特性，它可以以ASCII文本格式存储，也可以二或八进制专有格式存储。 D:building文件夹中的建筑矢量数据描述了建筑的外形以及结构和高度。

地图文件中的Heights文件夹中的Projection文件主要定义的是（）

A:数字地图的椭球模型定义 B:数字地图的精度定义 C:数字地图的投影方式定义 D:数字地图的地物定义

在地图投影时，查看地图文件HeightS下的（）文件，读取地图（），再寻找合适的坐标系。

PRojeCtioN；中央经线位置

坐标系设置时，需要根据地图文件夹HeightS中的（）文件里面的内容进行设置。

坐标系设置时，需要根据地图文件夹（）中的pRojeCtioN文件里面的内容进行设置。

A:heightS B:ClutteR C:veCtoR D:text

规划仿真的模拟布点中，对于电子地图信息，（）是必须的，txt是可选的

A:heightS B:veCtoR C:ClutteR D:buildiNg

坐标系设置时，需要根据地图文件夹Heights中的 ；（）文件里面的内容进行设置。

定义上下分割的框架的大小的是？（）

A:Rows B:cols C:widths D:heights

A "radiative forcing" is any change imposed on the Earth that affect the planetary energy balance. Radiative forcings include changes in greenhouse gases (such as carbon dioxide and ozone), aerosols in the atmosphere, solar irradiance, and surface reflectivity. A forcing may result from either a natural or an anthropogenic cause, or from both, as in the case of atmospheric aerosol concentrations, which can be altered either by volcanic action or the burning of fossil fuels. Radiative forcings are typically specified for the purpose of theoretical global climate simulations. In contrast, radiative "feedbacks" are environmental changes resulting from climate changes and are calculated from scientific observation. Radiative feedbacks include changes in such phenomena as clouds, atmospheric water vapor, sea-ice cover, and snow cover. 　　The interplay between forcings and feedbacks can be quite complex. For example, an increase in the concentration of atmospheric water vapor increases solar irradiance, thereby warming the atmosphere and, in turn, increasing evaporation and the concentration of atmospheric water vapor. A related example of this complex interplay also shows the uncertainty of future climatic changes associated with forcings and feedbacks. Scientists are unsure how the reduction of ozone will ultimately affect clouds and, in turn, the Earth temperature. Clouds trap outgoing, cooling radiation, thereby providing a warming influence. However, they also reflect incoming solar radiation and thus provide a cooling influence. Currents measurements indicate that the net effect of clouds is to cool the Earth. However, scientists do not know how the balance might shift in the future as cloud formation and dispersion are affected by ozone reduction. 　　Contributing to this uncertainty is the complexity of the mechanisms at work in the process of ozone reduction. The amount of radiation reaching the earth’’s surface and the amount of reradiated radiation that is trapped by the greenhouse effect influence the Earth’’s temperature in opposite directions. Both mechanisms are affected by the vertical distribution of ozone. Also, the relative importance of these two competing mechanisms depends on the altitude at which ozone changes occur. In a recent NASA-sponsored aircraft study of the Antarctic ozone hole, chlorine monoxide was measured at varying altitudes. The measurements suggest that chlorine plays a greater role, and oxides of nitrogen a lesser role, than previously thought in the destruction of ozone in the lower atmosphere. The study concluded that simultaneous high-resolution measurements at many different altitudes (on the scale of 0.1 kilometer in vertical extent) are necessary to diagnose the operative mechanisms. These findings have called into question conventional explanations for ozone reduction, which fail to adequately account for the new evidence. (NASA=National Aeronautics and Space Administration <美>国家航空航天局) The NASA-sponsored study of the ozone hole

A:failed to demonstrate of the variablity of ozone amounts at varying heights. B:did not raise doubts about current means of measuring ozone reduction. C:neglected to underline the complexity in measuring radiative changes. D:overlooked the distinction between early theories and recent evidence.

Clear Cell Heights表示是

A:清除单元格列宽 B:清除行高 C:清除列宽 D:清除单元格行高