三年级科学机械滑轮(B)
Quiz
•
Science
•
1st - 12th Grade
•
Practice Problem
•
Hard
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15 questions
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1.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
上图显示一种滑轮。
哪项有关滑轮的说明是正确的?
这是一种动滑轮
滑轮的轮子中央有轴
把绳子往上拉时,重物就会上升
这种滑轮只能使工作更容易,但不能省力
2.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
上图显示四种滑轮。
哪些滑轮能省力?
P和R
P和S
Q、R和S
P、Q和S
3.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
滑轮有什么用途?
减轻物体的重量
将物体劈开两个部分
将重物从高处运往低处
将重物从低处运往高处
4.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
上图显示一个定滑轮。
X、Y和Z代表什么?
X:滑轮 Y:绳子 Z:重物
X:重物 Y:滑轮 Z:绳子
X:滑轮 Y:绳子 Z:重物
X:绳子 Y:重物 Z:滑轮
5.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
这是?
动滑轮
滑轮组
定滑轮
6.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
上图显示四种工具。
那种工具有采用滑轮来操作?
7.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
滑轮的定义:
滑轮是一种
简单机械
复杂机械
简单工具
简单美食
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