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【题目】2011717日,我国南极中山站(69°22′S76°22′E)越冬科考队的队员们迎来了极夜后的第一次日出。据材料回答下列问题。

1

A. 东北方向 B. 东南方向 C. 西北方向 D. 西南方向

2

A. 30天左右 B. 50天左右 C. 70天左右 D. 90天左右

【答案】

1D

2B

【解析】试题分析:

1】当中山站位于南极圈内,717日,当中山站极夜后出现第一次日出时,该日昼长由前一天的0小时,到大于0小时,即日出的地方时(76°22′E)为12时之前的较短时刻,太阳直射在北半球,直射点经度约为76°E,所以太阳位于天津观测者的西南方向.故选D

2】根据对称原理,622日到717日出现极夜的天数为25天,那么622日前也有25天,即中山站极夜持续时间为50天.选择B

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