教育目的是国家或政党根据一定时期的总路线、总任务规定的教育工作的发展思路和发展方向。
参考答案:错
Color TV was first shown in 1929. It took more than two decades, ________, until 1951, for
color broadcasts to begin in the USA.
A. though B. therefore C. otherwise D. anyway
判断数控机床的可靠度主要根据( )。
A.机床精度 B.机床机械效率C.机床实际无故障工作概率 D.机床生产率