1.地球是一个不发光又不透明的球体
2.由于地球不停地运动,昼夜也就不断地交替．昼夜交替的周期,或太阳高度的日变化周期为24小时,叫做一太阳日
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- 1The owner and editor of the newpaper ( is ) to attend the conference.
- 2如果所有的动物都像我们人用两只脚走路,世界将会是什么样?
- 3The weather in South China __ are hot and rainy at this time
- 4怎么证明两角和的余弦公式 Cos(x+y)=CosxCosy-SinxSiny
- 5用这些句子造句I likeswimming.Play the game.Reading a book"I don't likePlay a ball game.speech "
- 6(2x+1)平方-x四次方
- 7一块三角形夹板,面积为0.36平方米.夹板的底为1.2米,高是多少分米?（用方程解）
- 8It took Yang Liwei about 21 hours to circle the earth 14 times的句子翻译
- 9一道英语题-surely you can turn to David for help.
- 10有一对苹果,不到30个,平均分给6个小朋友,还剩2个;平均分给8个小朋友,也还剩2个,问这堆苹果有多少个?