C级储量

题型:名词解释

问题:

C级储量

考点:矿山工程技术矿产勘查理论与方法矿产勘查理论与方法题库
题型:名词解释

选择恰当的同音字组词。

 è       耗           人     

 jì       妒           信     

 bì  完 归赵   墙      一 千里

题型:名词解释

材料一:北京时间2013年12月2日1:30,嫦娥三号点火发射。这是我国第一次向地外发射软着陆探测器(月球车),首辆自主研制的月球车取名玉兔。玉兔身上装满了多种精密探测仪器,这些仪器正常工件温度在-40ºC至50ºC。肩部有两片可以伸缩的太阳能帆板电池,为月球车行走提供能源。

材料二:月球是离地球最近的自然天体,体积是地球的1/49,重力加速度是地球的1/6,微弱的重力使月球无法保持大气。月球表面坑穴星罗棋布,布满颗粒细小的月尘,热容量很小。月球自转方向周期与公转一致(见下图)。

材料三:为让月球车到月球上顺利执行任务,科研人员将玉兔放在我国最接近月球表面环境的库姆塔格沙漠进行地面外场试验(见下图)。

材料四:登月是人类迈向太空的第一步,月球上丰富的资源和独特的科研环境激发了人类巨大的探索热情,有的国家还计划在技术成熟时,在月球上建立人类永久定居点,以缓解地球上日益增大的人地矛盾。

阅读上述材料,回答(1)~(3)题。(8分)

(1)据材料分析说明,玉兔在月球表面执行任务时可能会遇到哪些困难?(3分)

(2)地面外场试验场地要尽可能地模拟真实的月球表面,你认为最难模拟的条件是什么?(1分)

(3)假定多年之后,一天文爱好者在月球上的人类固定居住地,长期用肉眼观测地球,回望故乡。请简要描述他所看到的地球情形。(从颜色、形状、大小、亮度、运动等方面描述)(4分)

题型:名词解释

阅读理解

根据短文内容,从短文后的选项中选出能填入空白处的最佳选项.选项中有两项为多余选项。

     Traditional fisheries may no longer be the world's most important provider of fish.  1 . The Food and

Agriculture Organization says aquaculture is growing by a rate of 6.6 percent a year.

     Aquaculture now produces forty-six percent of the world's supply of fish.  2 . The report also said

aquaculture earned more money in 2008 than traditional fisheries.

    In aquaculture, fish are raised in tanks or small bodies of water called ponds. They also are raised in

cages or nets in oceans, lakes and rivers.

     The report says increased aquaculture has helped people around the world eat record amounts of

fish.  3. But the FAO says the current yearly wild-fish harvest of 90 million tons shows no improvement.

Decreasing numbers of fish and stronger catch limits have reduced the possibilities for catching wild fish.

     The FAO report says about thirty-two percent of world supplies are overfished, depleted(大量削减)

or recovering. It said these supplies of fish need to be urgently rebuilt.

      4. They say the nets and cages permit fish diseases and pests to spread. Some aquaculture critics

doubt that aquaculture can keep growing at the current rate. But Wally Stevens of the trade group

Global Aquaculture Alliance says the industry must continue developing to feed growing populations.

     Mr. Stevens says a one hundred percent increase in fish farming over ten years is necessary to keep

providing for people at the current level. He notes that aquaculture creates jobs and wealth, especially

for people in coastal areas of China. The FAO reports that China remains the world's largest

fish-producing nation.  5.

A. Hungary is rich in waterways, but traditionally most Hungarians eat fish only at Christmastime.

B. A new United Nations report shows that fish farming or aquaculture may soon lead fish production.

C. Last week a study of one hundred ninety-nine countries and territories confirmed what many people

may have already noticed.

D. The FAO says each person ate an average of almost 17 kilograms of fish last year.

E. China produces more than sixty percent of the world's farmed fish.

F. That represents a forty-three percent increase from 2006.

G. Some scientists have criticized aquaculture.

题型:名词解释

《国家安全法》中规定的“优先通行、使用权”是指什么?

题型:名词解释

定喘汤组成中不含下列哪味药物()

A.桑叶

B.白果

C.黄芩

D.半夏

E.麻黄

更多题库