Your younger sister needs $50 to buy a n...

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【单选题】

Your younger sister needs $50 to buy a new bike. She has opened a lemonade stand to make the money she needs. She currently is charging 25 cents per cup, but wants to adjust her price to earn the money faster. If you know that the demand for lemonade is elastic, what is your advice to her?

Leave the price the same and be patient.

Raise the price to increase total revenue.

Lower the price to increase total revenue.

There isn’t enough information given to answer this question.

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时间

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【单选题】对三个投影面都倾斜的平面称为( )。

一般位置平面

投影面平行面

投影面垂直面

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【单选题】主张多出口、少进口,以达到积累货币财富的目的,这种思想属于

贸易保护主义

贸易自由主义

重商主义

凯恩斯主义

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车身侧倾

车辆后部下坐

车辆栽头

颠动、上下跳振

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【单选题】十字路口交通灯的控制系统工作步的转换原则是（）

时间

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正确

错误

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【简答题】对照说明填写下列的对应轨道。可以放置视频素材或者字幕素材。可以放置视频音频素材或字幕素材。可以放置音频素材。