【单选题】At a certain point in space the electric potential is 20 V. A 4.0-μC charge is brought from infinity to that point. What is the electric potential energy of this charge at that point?
【判断题】变动成本法能够满足企业内部经营管理的需要。 ( )
【单选题】_________, or energy carrier, is an energy form which has been transformed from primary energy sources. Electricity is one of the most common energy carriers, being transformed from various primary en...
【简答题】一条染色体(未复制的)是____条DNA分子
【单选题】从 开始为客人服务调味酱油或者醋。( )