【简答题】Spanning the novels is Cha's great theme, Chinese i___14___。
【简答题】A.He is working hard all the time. B.He is lazy all the time. C.He works hard so as to get his three meals. D.He often has his three meals on time.
【多选题】下列表述中,对波阻抗描述错误的是( )。
【单选题】He is working hard for fear that he __.
【单选题】He is working hard for fear that he___.
【简答题】加里培林认为,心智技能的形成过程包括五个阶段:活动定向阶段、物质活动或物质化活动阶段、有声的言语活动阶段、( )、( )。
【单选题】下列关于理想介质中,均匀平面波波阻抗的描述错误的是