一般而言,下列哪种做法可使住宅冬暖夏凉,降低空调耗能() A.屋内放置冰块 B.建造 发布时间:2018-11-16 20:33 │ 来源:www.tikuol.com 题型:单项选择题 问题: 一般而言,下列哪种做法可使住宅冬暖夏凉,降低空调耗能()A.屋内放置冰块B.建造火炕C.开启落地窗D.建造屋顶花园
题型:单项选择题 改错。( ) 1. You were to sleep on the train. ________________ A B C ( ) 2. This picture is from you Danny. ________________ A B C( ) 3. It is too small to me. ________________ A B C ( ) 4. Li Ming walks to the park yesterday. ________________ A B C( ) 5. We are haveing fun in the park. ________________ A B C 查看答案
题型:单项选择题 如图所示,实线为电场线,虚线为等势线,且相邻两等势线间的电势差相等.一正电荷在等势线ф3上时,具有动能20J,它运动到等势线ф1上时,速度为零,令ф3=0,那么,当该电荷的电势能为4J时,其动能大小为( )A.16JB.10JC.6JD.4J 查看答案