【单选题】【消耗次数：1】
当某地气温年较差为20℃，地理纬度为30°N时，其大陆度为（）k=（1.7⊿t/sinΦ）-20.4
①
1.7
②
47.6
③
19.6
④
20.4
参考答案：
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【单选题】
A点坐标为（10、20、30），B点坐标为（30、20、30）则AB距离为______。
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