ALL FIVE questions are compulsory and MUST be attempted
参考答案：
（）的阻抗继电器能较好地符合短路时测量阻抗的性质，反应故障点过渡电阻能力强，避越负荷阻抗能力好。
A、抛圆特性
B、四边形动作特性
C、偏移阻抗特性
从泉水的矿物质含量来划分，小于1克/升为淡水泉，超过此标准的为矿泉。( )
ALL FIVE questions are compulsory and MUST be attempted
ALL FIVE questions are compulsory and MUST be attempted