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光速 guāngsù
agric. rate of light
IT velocity of light
phys. speed of light; light speed; speed of light in vacuum; luminal speed; speed of light (299.79250 X 106米/秒)
tech. electromagnetic constant; light velocity; ray velocity
光速≈ 300 000km/s guāngsù
telecom. velocity of light
光 速
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