【单选题】已知双曲线 的实轴长为2,则该双曲线的离心率为( )
【简答题】若双曲线 的实轴长、虚轴长、焦距成等差数列,则双曲线的离心率为__________.
【多选题】根据预防未成年人犯罪法的规定,下列属于未成年人不该实施的不良行为有
【单选题】Among Yu’s helpers in the process of his flood taming,who offered a map?
C.
the water god of Huanghe
【单选题】双曲线 的实轴长是虚轴长的 倍,则 ( )
【单选题】Upon completing his examination over the patient, the doctor offered his judgment of her conditions.
【单选题】His classmates offered him their congratulations ______ his successful performance.