【简答题】直接写出得数. 7 r6 + r 6 = 6 7 - 6 7 = r 6 + r o = o 8 -七.r6地= 6.4+ o 地 = r七+ 6 地 = r- o 7 = 6 7 - 6 7 =
【单选题】临时用电线路严禁采用三相一地,( ),一相一地制供电。
【简答题】He was too excited _________. [ ] A. speak B . to speak C. not to speak D. speaking
【简答题】神经纤维是由神经元的()和包在它外表的()构成。根据是否有(),将神经纤维分为有髓神经纤维和无髓神经纤维。