【单选题】Why among the domain names not approved by the board Thursday was .kids?
A.
As it said it could lead to Web sites with content harmful.
B.
As it said it could be beneficial for children.
C.
As it said it could not get the profit.
D.
As it said it could lead to boom registries.
【判断题】直流串励式电动机: 产生转矩,将蓄电池输入的电能转换为机械运动
【单选题】It is said that the engines of Flight MH370____while flying over the Indian Ocean,with all on board killed .
【单选题】直流电动机的作用是将蓄电池输入的电能转换为( )。
【简答题】放射医学是研究辐射对()而逐步发展起来的一门()。
【判断题】串励直流电动机的反转宜采用励磁绕组反接法。()
【单选题】( )对一个产品系统的生命周期中输入、输出及其潜在环境影响的汇编和评价,对贯穿产品生命周期全过程 ( 即所谓从摇篮到坟墓 )— 从获取原材料、生产、使用直至最终处置 — 的环境因素及其潜在影响的研究。
【单选题】产生转矩,将蓄电池输入的电能转换为机械运动
【判断题】经济学的发展经历了重农主义阶段、古典主义阶段、新古典主义经济学阶段和现代主义阶段。