Zhang Heng invented the world’s first water-powered armillary sphere and the world’s first seismometer.
Zhang Heng invented the world’s first water-powered armillary sphere and the world’s first seismometer.
By watching the armillary sphere made by Zhang Heng, one could find out ______.( ). A: the rising and falling of the stars B: how an eclipse developed C: when an earthquake would strike D: the rotation speed of the earth
By watching the armillary sphere made by Zhang Heng, one could find out ______.( ). A: the rising and falling of the stars B: how an eclipse developed C: when an earthquake would strike D: the rotation speed of the earth
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