
3年级科学(单元10:机械)总复习
Authored by Origin Acc
Science
3rd Grade
Used 3+ times

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70 questions
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1.
MULTIPLE CHOICE QUESTION
45 sec • 1 pt
我们使用的工具应用了简单机械地原理来操作。应用简单机械原理操作的工具有什么好处?
使工作变得简单和有效率
使工作变得更费力
使工作机会增加
使工作量减少
2.
MULTIPLE CHOICE QUESTION
45 sec • 1 pt
__________ 的位置固定。把绳子向下拉,重物就会上升。
动滑轮
定滑轮
滑轮组
3.
MULTIPLE CHOICE QUESTION
45 sec • 1 pt
以下哪项是滑轮的应用?
升起帆船的帆。
用扫把扫地。
用拖把抹地板。
拔河。
4.
MULTIPLE CHOICE QUESTION
45 sec • 1 pt
以下哪项不是滑轮的应用?
拉起渔网。
升旗与降旗。
帮助攀岩者爬山岩石。
滑板
5.
MULTIPLE CHOICE QUESTION
45 sec • 1 pt
当我们应用定滑轮时,向下拉绳子,重物会__________ 。
往上升。
往下降。
保持不变。
6.
MULTIPLE SELECT QUESTION
45 sec • 1 pt
什么是滑轮?
滑轮可以用来提起重物并运到高处,使人们的工作变得较容易
滑轮由绳子和周缘有槽的轮子所组成
滑轮是一种简单机械
滑轮是一种复杂机械
7.
MULTIPLE SELECT QUESTION
45 sec • 1 pt
滑轮的重要性是什么?
使工作较容易进行
进行工作时较省力
让我们较安全地进行攀爬活动
帮助进行拯救工
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