下列哪项是霍乱弧菌的定植因子()
A.鞭毛
B.毒素协同调节菌毛
C.脂多糖
D.非毒素蛋白
E.可溶性血凝素
参考答案：A, B, C, E
______ Chief Engineer, as his family had expected, made his father happy and proud.
A．Mike being appointed
B．Mike’s appointed
C．Mike appointing
D．Mike’s being appointed
高压电抗器的作用是平衡线路的___________而避免工频过电压。
A、参数
B、电流
C、电压
D、充电功率
