四年级科学练习58（杠杆）
Authored by LIEW Moe
Science
4th Grade
Used 263+ times
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10 questions
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1.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
简单机械可分为几种？
5
6
7
8
2.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
剪刀属于哪一类杠杆？
一
二
三
3.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
以下哪个是第二类杠杆？
4.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
下图那个是第三类杠杆？
5.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
核桃夹应用杠杆原理操作。
P、Q和R代表什么位置？
P：支点，Q：重点，R：力点
P：重点，Q：支点，R：力点
P：力点，Q：重点，R：支点
6.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
以下哪一种工具属于第二类杠杆？
7.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
小明无法开启紧闭的饼干桶，哪项原理能帮助他？
杠杆
尖劈
齿轮
螺旋
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