题目内容

【题目】一架飞机从甲地(60°N,100°W)起飞,沿最近航线匀速飞行10小时抵达乙地(60°N,80°E)。据此回答下列问题。

【1】飞机飞行航线

A.一直不变 B.先向东北后向东南

C.先向西北后向西南 D.先向北后向南

【2】这架飞机若以同样的速度,沿60°N纬线飞行,抵达乙地大约需要

A.8小时 B.10小时 C.15小时 D.20小时

【答案】

【1】D

【2】C

【解析】

试题分析:

【1】展开可知,100°W与80°E恰好相差180°。因此最短路线为沿100°W经线飞行、跨越北极点后就是80°E经线。飞机飞行航线先向北后向南

【2】沿最近航线匀速飞行,经过的路程总共是(30°+30°)*110= 6600千米,飞行速度是660千米/小时。 如果沿60°N纬线飞行,则总共经过(100°+80°)*110*1/2= 9900千米。因此飞行时间为15 小时 .

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年份

人口/×104

耕地面积/×104hm2

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1368

6.693

4.151

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水浇地

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平坡地

缓坡地

陡坡地

急坡地

其他

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河川

阶地

0.01

0.1

1.12

0.22

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沟壑

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