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Doctor: How long have you had your headache?Jack: 2 days.Doctor: What does the pain feel like?Jack: 1Doctor: Does your neck feel stiff?Jack: 2Doctor: Does bright lights hurt your eyes and make your headache worse?Jack: 3Doctor: Do you have a rash on your arms, legs or body?Jack: 4Doctor: Do you have a fever?Jack: I don't think so.Doctor: Do you have any other symptoms?Jack: 5Doctor: Are you upset or stressed in any way?Jack: 6Doctor: Have you been drinking fluids regularly?Jack: 7Doctor: I need to examine you.Jack: 8

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电能表的发展经历了哪几个阶段?

A. 感应式机械电能表
B. 机电式电能表
C. 电子式电能表
D. 智能电能表

智能营销的基础平台是(),它完成( )、( )、( )目标,这就要求电能表不仅具有电能计量功能,还必须具备( )、( )、( ),甚至网关等功能。

模拟量是指( )的电量,如按正弦规律变化的电压、电流、功率等。

数字量是指可用( )表示的量,其信号特点是具有( )。

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