我们可以通过用丝绸摩擦(rub)玻璃棒( glass rod)得到相同的 结果。 We get the same results by rubbing a glass rod with silk. 在使用上面的等式时,必须注意符号。 In using the equation above, attention must be paid to the sign. 且把这些数值代入该方程后,人们发现无线电波的速度与 光速一样大。 Upon substituting these values into the equation, it was found that the velocity of radio waves is as great as that of light我们可以通过用丝绸摩擦(rub)玻璃棒(glass rod)得到相同的 结果。 We get the same results by rubbing a glass rod with silk. 在使用上面的等式时，必须注意符号。 In using the equation above, attention must be paid to the sign. 一旦把这些数值代入该方程后，人们发现无线电波的速度与 光速一样大。 Upon substituting these values into the equation, it was found that the velocity of radio waves is as great as that of light