四年级科学 机械
Quiz
•
Science
•
1st - 10th Grade
•
Medium
CELIA HO Y W
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20 questions
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1.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
“边缘呈齿状的轮,转动一个齿轮能带动另一个齿轮。”
以上的简述是指哪样简单机械?
斜面
滑轮
齿轮
螺旋
2.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
“是一种变形的斜面,螺旋是缠绕在圆柱体上的斜面。”
以上的简述是指哪样简单机械?
斜面
螺旋
尖劈
轮轴
3.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
以下哪项是简单机械 “斜面” 的正确简述?
一根绕着某个固定点转动的棍棒。
是一种变形的斜面,螺旋是缠绕在圆柱体上的斜面。
由两个斜面组成的简单机械。
两端处于不同的高度而形成倾斜的一个平面。
4.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
以下哪项是简单机械 “螺旋” 的正确用途?
减少物体移动时所产生的摩擦力。
能较容易地提起重物。
将两个物体嵌(qiàn)合在一起。
能控制机械转动的快慢和方向。
5.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
什么是复杂机械?
结构简单外形复杂的机械
可使工作省时但费力的机械
由两种以上的简单机械组成
可轻易进行工作的工具
6.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
哪项有关上图齿轮的说明是正确的?
小齿轮转得比较慢
大齿轮转得比较快
它们转动的方向一致
它们以相反的方向转动
7.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
图中的活动运用了哪些简单机械原理?
轮轴和螺旋
尖劈和杠杆
杠杆和齿轮
尖劈和轮轴
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