大一物理题.A uniform steel rod of length 1.20 m and mass of 6.40 kg has attached to each end a small ball of mass1.06 kg.The rod is constrained to rotate in a horizontal plane about a vertical axis through its midpoint.At a certain instant it is

大一物理题.A uniform steel rod of length 1.20 m and mass of 6.40 kg has attached to each end a small ball of mass1.06 kg.The rod is constrained to rotate in a horizontal plane about a vertical axis through its midpoint.At a certain instant it is uniform为什么是a uniform而不是an uniform? uniform为什么是a uniform而不是an uniform? a uniform还是an uniform急 wear a uniform 还是wear uniform 请问 a uniform gravitational field 中的 uniform a还是an uniform meke a uniform是什么意思 求教大一物理题 第八题, uniform前+a还是an a uniform是什么意思一个什么 a uniform是啥意思? 在英语里,是a uniform,还是an uniform 是wear a uniform还是wear the uniform wear a uniform为什么不用an uniform前为什么要加a Can me make a uniform for you The boy in a black uniform.