蓄电池母线的固定方式有用（）固定。
A．鼓形绝缘子
B．针式绝缘子
C．蝶式绝缘子
D．悬垂绝缘子串
参考答案：B, C
当发现冷却器内漏后，应采取的处理方法是（）。
A、照常运行
B、全开进出口阀
C、关副线阀
D、切出处理
An oligopolistic firm:（）
A. will consider the potential response of its rivals when making business decisions.
B. is likely to be formed when the minimum-cost output is only a small portion of the market output.
C. is likely to be formed when barriers to entry are low.
