（）在土壤系统形成过程中的作用一般只是引起地表物质与能量的再分配，并不提供任何新的物

______可以把一个大的网络划分成若干小的网络而实现网络管理。

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The massive 8.8 quake, the seventh strongest in recorded history, hit Chile and should have shortened the length of an Earth day by 1.26 milliseconds, More impressive is how much the quake shifted the Earth’s axis（地轴）.

The computer mode! Used to determine the effects of the Chile earthquake effect also found that it should have moved the Earth’s figure axis by about 8 cm. The Earth’s figure figure axis is not the same as its north-south axis, which Earth turns around once every day at a speed of about 1,604 kph. The figure axis is the axis around which the Earth’s mass is balanced. It is offset（偏离） from the Earth’s north-south axis by about 10 meters.

Strong earthquakes can change Earth’s days and its axis. The 9.1 Sumatran earthquake in 2004, which set off a deadly tsunami（海啸），should have shortened Earth’s days by 0.0068 milliseconds and shifted its axis by about 7cm.

One Earth day is about 24 hours long. Over the course of a year, the length of a day normally changes gradually by one millisecond, It increases in the winter when Earth more slowly, and decreases in the summer.

The Chile earthquake was much smaller than the Sumatran quake, but its effects on the Earth are larger because of its location. The fault（断层） responsible for the 2010 Chile quake also cuts through Earth at a larger angle that the Sumatran quake’s fault. This makes the Chile fault ore effective in moving the Earth’s mass vertically and hence more effective in shifting the Earth’s figure axis.

The findings are based on early date available on the Chile earthquake. The Chile earthquake has killed more than 700 people and cause widespread damage in the South American country.

64．What’s the biggest problem caused by the Chile quake?

A．It is the seventh strongest in recorded history.

B．It should have shortened the length of an Earth day.

C．It shifted the Earth’s axis.

D．It made the day longer on Earth.

65．Comparing the Sumatram earthquake with the Chile earthquake, we know that__________.

A．the Sumatram earthquake had more effect on Earth

B．the location of the Chile earthquake is responsible for its larger effects on Earth.

C．the Sumatram earthquake was less destructive

D．the Chile earthquake fault changed the Earth’s mass

66．What does the word “it” in the 4th paragraph refer to?

A．The leng of a day.           B．The axis.

C．One millisecond.            D．The change of the day.

为满足经济建设对基础测绘资料的需求，完善基础地理信息库，某市准备生产该地区1:1万比例尺的数字地面高程模型(DEM)。现已完成了前期的准备工作，包括：全部测区的航空摄影、区域网外业控制点的测设和解析空中三角测量(空三加密)等工作。
1．测区自然地理概况
测区位于华北地区的一个地级城市，总面积约4500km²。测区为平地和丘陵两种地形，测区内海拔高度平均低点为20m，最高海拔230m。
2．主要技术依据
(1)《基础地理信息数字产品1:10000、1:50000生产技术规程第2部分：数字高程模型(DEM)》(CH/T 1015.2—2007)；
(2)《基础地理信息数字产品1:10000、1:50000数字高程模型》(CH/T 1008—2001)；
(3)《基础地理信息数字产品1:10000、1:50000生产技术规程第1部分：数字线划图(DLG)》(CH/T 1015.1—2007)；
(4)《数字测绘成果质量要求》(GB/T 17941—2008)；
(5)《数字测绘成果质量检查与验收》(GB/T 18316—2008)；
(6)平面系统采用1980西安坐标系；
(7)高程系统采用1985国家高程基准。
3．航空摄影资料
航空摄影采用传统的航空摄影方式，航摄比例尺1:1万，航摄像机型号为RC—30，像幅为23cm×23cm，航摄仪焦距152mm，影像扫描分辨率0.02mm，像片类型为彩色片。
航摄总面积为4500km²，测区共布设34条航线，每条航线112张航片，测区航片总数为3808张，东西向飞行，航片的航向重叠65%，旁向重叠35%。
航空摄影成果已通过质检部门的检查验收，其飞行质量和影像质量均满足规范和设计要求。
4．其他资料情况
1)区域网外业像片控制点测量成果情况
整个测区的区域网外业控制点的布设和测量工作已全部完成，分别按平地和按丘陵地区布设方案实施，其基本情况如下。
(1)平坦地区航线按每4条基线在其周边布设6个平高点。
(2)丘陵地区航线按每4条基线在其周边布设8个平高点。
(3)区域网外业像片控制点的精度和成果质量均符合规范和技术设计的要求，质检部门已同意将该成果移交给解析空中三角测量和立体测图工序使用。
2)解析空中三角测量成果基本情况
整个测区的解析空中三角测量的工作已全部完成，其成果质量符合规范和技术设计的要求，并已全部通过质检部门的检查验收，同意移交给下一工序使用。
问题：

试述DEM的质量检查。

直流电机的选择主要根据生产机械性能要求来进行的。

简单分析酒精生产过程中酒母培养不好的因素。