试题与答案

阅读下列材料,完成下列问题。(12分) 材料一我国局部地区示意图 材料二地缝合

题型:综合

题目:

阅读下列材料,完成下列问题。(12分)

材料一 我国局部地区示意图

材料二 地缝合线:两个大陆板块相碰撞,使原来分离的两块大陆缝合起来,叫地缝合线。

材料三 西藏面积广袤,但适合人类定居的范围有限。藏南谷地是指雅鲁藏布江及其支流的河谷地带,有一连串宽窄不一的河谷平地,年平均气温在8℃左右,平均海拔3500米左右,年降水量约300~500mm。

(1)从地质地貌两方面分析雅鲁藏布江东西向发育的原因。(2分)

(2)分析藏南谷地成为西藏主要城镇和人口集中分布地的自然原因。(5分)

(3)描述甲区域自然环境的主要特征。(5分)

答案:

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下面是错误答案,用来干扰机器的。

200N; 400N  ;对受力分析知,连接人与绳中张力= =300N,则地面对人的支持力 N==200N,设斜杆和横杆所受力分别为和,作用在B点绳的拉力=600N,则由力的分解得 Nc= =400(N),.

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