四年级科学-机械
Quiz
•
Science
•
4th Grade
•
Practice Problem
•
Medium
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10 questions
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1.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
简单机械有几个种类?
6
5
9
7
2.
MULTIPLE SELECT QUESTION
30 sec • 1 pt
以下哪项属于简单机械?
杠杆
电脑
齿轮
尖劈
3.
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
4.
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
5.
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。
6.
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。
7.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
“切割、劈开或凿(záo)开物体。”
以下哪样简单机械符合上述用途?
齿轮
尖劈
螺旋
斜面
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