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18. Houfeng seismograph is the first seismograph in the world invented by Zhang Heng, a famous scientist in China. _ _ _ _ _ _ (True or false
Answer: Analysis: (1) In A.D. 132, Zhang Heng invented and manufactured the seismograph of the waiting wind. (2) This is the first instrument for sensing earthquakes in the world. (3) It uses the principle of inertia and takes pendulum and lever mechanism as the main structural modes to determine the direction of earthquake.

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