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【单选题】
平面与圆锥截切,断面形状为三角形时,截平面( )A.
平行于
B.
倾斜于轴线
C.
过锥顶
D.
平行于轴线
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举一反三
【单选题】You use a straightforward time order, following the event from the beginning to the end: first this happened, next this happened, and finally this happened. This narration is written in _________.
A.
flashback
B.
flashforward
C.
changeable order
D.
chronological order
【简答题】After you have _______________ in a shop or finished a meal in a restaurant and paid the check, pretend that all this happened in an __________________ country and try to ______________ in English.
【简答题】Wind, water, fire, and ice—these powerful natural forces have shaped the land of America in the past. They are still changing it today. The Colorado River slowly cut down through stone to make the Gra...
【简答题】辐射通量 F e 又称为 ,是指以辐射形式发射、传播或接收的功率。
【简答题】Wind, water, fire and ice—these powerful natural forces have shaped the land of America in the past. They are still changing it today. The Colorado River slowly cut down through stone to make the Gran...
【简答题】This happened in Australia ...when I was about 1) ________. I spent a few days at a hotel in Alice Springs and went to Ayers Rock and ...Well, anyway, one day, I went out for a walk ... in the outback...
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