For measuring length of the curve line, one should have:
A
A thread to measure the length of the curve line
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B
One scale to measure the length of the thread
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C
One steel rod to measure the length of the curve line
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D
Both A and B
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Solution
The correct option is C Both A and B
The length of a curve line can be measured with a thread. And the length of thread used can further be measured from a scale. In this way, we can measure the length of the curved line in two steps. One steel rod cannot be used to measure the length of the curved line.