电力系统发生单相接地或出现绝缘下降故障时，三相五柱式电压互感器辅助绕组将有（）输出。
A.电流
B.电压
C.零序电压
D.过电压
参考答案：C
She is _____ newcomer to _____chemistry but she has already made some important discoveries.
A．the; the
B．the; /
C．a; /
D．a; the
双侧肺泡呼吸音均降低见于
A．支气管炎B．肺结核C．肺炎D．肺气肿E．肺癌
