三年级科学复习
Authored by LIM Moe
Science
2nd Grade
Used 13+ times
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70 questions
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1.
MULTIPLE SELECT QUESTION
30 sec • 1 pt
图中是什么简单机械？
轮轴
齿轮
轮子
滑轮
2.
MULTIPLE SELECT QUESTION
30 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
30 sec • 1 pt
图中是哪一类滑轮？
动滑轮
定滑轮
滑轮组
4.
MULTIPLE SELECT QUESTION
30 sec • 1 pt
下面哪一个是动滑轮？
5.
MULTIPLE SELECT QUESTION
30 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？
6.
MULTIPLE SELECT QUESTION
30 sec • 1 pt
下面哪一种机械种类能帮助我们省力？
7.
MULTIPLE SELECT QUESTION
30 sec • 1 pt
下面哪项有关图中机械的说明是正确的？
滑轮组不能省力
滑轮组能改变力的方向，但不能省力
滑轮组能改变力的方向，也能省力。
滑轮组不能改变力的方向，但能省力
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