
4年级 声音
Authored by Fen Xiao
Science
4th Grade
Used 22+ times

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12 questions
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1.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
上图是哪种声音的反射?
回音
声呐
超声波
雷达
2.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
上图是哪种声音的反射?
回音
声呐
超声波
雷达
3.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
上图是哪种声音的反射?
回音
声呐
超声波
雷达
4.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
当我们说话时,周围空气会怎么样?
振动
消失
氧气变多
二氧化碳变多
5.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
会发出声音的物体称作为_______________。
基本需求
水源
声源
电源
6.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
声音碰到障碍物时会________________。
消失
反射
蒸发
移动
7.
MULTIPLE SELECT QUESTION
30 sec • 1 pt
我们可以通过以下哪3种方法来发出声音?
敲
睡
吹
弹
坐
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