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【多选题】

关于坐标系,下列说法正确的是(  )

A.
建立坐标系是为了定量描述物体的位置和位置的变化
B.
坐标系都是建立在参考系上的
C.
坐标系的建立与参考系无关
D.
物体在平面内做曲线运动,需要用平面直角坐标系才能确定其位置
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参考答案:
D
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举一反三

What does the woman imply?

A.
She didn’t clean the apartment.
B.
She’ll help the man clean his apartment.
C.
She needs to clean the lab.

What does the man imply?

A.
His coach didn’t help him enough.
B.
He had no chance of winning.
C.
He didn’t follow his coach’s advice.

What does the man say about the activities?

A.
They aren’t very good because they’re so different.
B.
He thinks they should do both.
C.
It doesn’t matter which one they do.
相关题目:
What does the woman imply?
A.
She didn’t clean the apartment.
B.
She’ll help the man clean his apartment.
C.
She needs to clean the lab.
What does the man imply?
A.
His coach didn’t help him enough.
B.
He had no chance of winning.
C.
He didn’t follow his coach’s advice.
What does the man say about the activities?
A.
They aren’t very good because they’re so different.
B.
He thinks they should do both.
C.
It doesn’t matter which one they do.
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