【简答题】如图,棱长为 的正方体 中, 为 中点,则直线 与平面 所成角的正切值为 ;若正方体的八个顶点都在同一球面上,则此球的表面积为 .
【单选题】如图 1-9 所示电路中支路的电压为()
【简答题】March 5,2015 Dear Employees, Please join me in welcoming Jim Johnson as our newest team member. Jim has become the General Manager since March 4.He will be in charge of a new project that can take our...
【单选题】Jane: Do you think he will come to my birthday party? Tom: ______
【单选题】如图 1-6 所示电路中所示支路的电压为()