A:苯和四氯化碳
B:溴苯和水
C:乙醇和溴水
D:乙醇和乙酸
_______ that the scientist will give us a talk next month?
抛物线y=x2+1的顶点坐标是____
复数i32i-1(i为虚数单位)的虚部是( )