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Which of the following parts of Jiegao serves the role of a lever?A．the supporting vertical column;B．the beam;C．the weight;D．the rope connecting to a bucket

Which of the following parts of Jiegao serves the role of a lever?
A、the supporting vertical column;
B、the beam;
C、the weight;
D、the rope connecting to a bucket

发布时间：2025-09-09 23:16:47

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答案：B

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