解释词语。
①悖论
②鳞次栉比
①悖论:逻辑学和数学中的矛盾命题。②鳞次栉比:形容房屋密集,像鱼鳞和梳子的齿一样,一个挨着一个地排列着。
We enjoy studying here very much, because the classroom by the cleaner every day.
Do you like ?
要测量小敏同学上楼梯时的功率,不需要测量他的( )