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【简答题】
如图所示是探究声音特性时常用的装置． （1）图甲中用竖直悬挂的泡沫塑料球接触发声的音叉时，泡沫塑料球被弹起，该实验现象说明______． （2）泡沫塑料球在实验中起什么作用？ （3）加大力度敲音叉，发生的现象如图示，由此你又可以得出什么结论？ （4）如图丙所示，敲击右边的音叉，左边完全相同的音叉把泡沫塑料球弹起，这个现象说明了什么？
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【简答题】BattleBots: Let the s Begin! Do you know what a "Boxbot", "Flipper", or "Thwackbot" is? They are types of robots that are built to fight one another on television. BattleBots is an American compan...
【简答题】阅读短文，选词填空。 jobs map look useful took how part What do you know about a robot? Robots are machines that can be made to do certain things. They are in all shapes. For example, puppy (a young...
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【单选题】What can robot do?
A.
Walk or roll on wheels
B.
Do housework, such as cleaning, washing.
C.
Both A and B.
【单选题】What can robot do?
A.
Walk or roll on wheels
B.
Do housework, such as cleaning, washing
C.
Both
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