如图所示一等边三三角形板,边长为a,沿三边分别作用有力F1、F2和F3,且F1=F2=F3,则此三角形板处于()状态。
A.平衡
B.移动
C.转动
D.既移动又转动
参考答案:C
如图所示一等边三三角形板,边长为a,沿三边分别作用有力F1、F2和F3,且F1=F2=F3,则此三角形板处于()状态。
A.平衡
B.移动
C.转动
D.既移动又转动
参考答案:C
Nowadays, more and more villagers have left to make a living in big cities. As a result, their children have become leftover children and they need more care. The survey below is from villages in Yongzhou, Hunan Province. Three hundred children were chosen to answer the questions.
Of all the five needs, the leftover children need _______ most.
Which of the following is TRUE according to the passage?
How many children think their happiest place is their school?
We can learn from the survey that _______.
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