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【单选题】
地理经度和地理纬度的度量范围分别是 。A.
0~90º、0~90º
B.
0~180º、0~180º
C.
0~180º、0~90º
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【单选题】Personally, I encourage people to do extreme sports because it is citizens’ elementary right to opt for their favorite sports. Attempts should be made to ensure these dangerous sports are thrilling an...
A.
a summary and final thought, a recommendation
B.
a summary and final thought, quotation
C.
a recommendation, a summary and final thought
D.
a summary and final thought, quotation
【单选题】若【图片】和【图片】都是单位向量，那么【图片】是单位向量吗？
A.
只有当 时， 是单位向量
B.
无论夹角如何， 总是是单位向量
C.
当 或 时， 是单位向量
D.
只有当 时， 是单位向量
【简答题】Nowadays more and more young athletes are taking part in the risky activities called “extreme sports” or “X-sports”. In the past young athletes would play baseball. Today, they want risk and excitemen...
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