三年级科学滑轮
Quiz
•
Science
•
3rd Grade
•
Practice Problem
•
Medium
LEE Moe
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10 questions
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1.
MULTIPLE SELECT QUESTION
45 sec • 1 pt
图中是什么简单机械?
轮轴
齿轮
轮子
滑轮
2.
MULTIPLE SELECT QUESTION
45 sec • 1 pt
下面哪项是图中简单机械的用处?
提起重物
切开物体
推动重物
3.
MULTIPLE SELECT QUESTION
45 sec • 1 pt
图中是哪一类滑轮?
动滑轮
定滑轮
滑轮组
4.
MULTIPLE SELECT QUESTION
45 sec • 1 pt
下面哪一个是动滑轮?
5.
MULTIPLE SELECT QUESTION
30 sec • 1 pt
下面哪一种机械种类能帮助我们省力?
6.
MULTIPLE SELECT QUESTION
45 sec • 1 pt
利用上图简单机械提升重物时, 需要向什么方向用力?
7.
MULTIPLE SELECT QUESTION
45 sec • 1 pt
根据上图完成句子。
动滑轮________改变力的方向,但 ___________ 省力。
不能, 不能
能, 能
能, 不能
不能, 能
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