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Science
1st Grade
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15 questions
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1.
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
2.
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
3.
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
4.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
什么是螺旋?
由斜面所组成,一端较厚
有重点、支点和力点
能减少抬起重物的负担
将斜面缠绕在圆柱体上
5.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
以下哪项工具应用了斜面的原理?
6.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
以下哪项有关滑轮的说明是正确的?
定滑轮是可以移动的
滑轮组由数个定滑轮组成
动滑轮需要更大的力来操作
定滑轮不能省力
7.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
以下哪项有关杠杆的说明是正确的?
杠杆由四种点所组成
支点越靠近重点越省力
杠杆分为五类
第三类杠杆最省力
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