EMS系统
参考答案：救援医疗服务系统，具有受理应答呼救的专业通讯指挥，承担院外救护的机构。
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Though an active politician, she succeeded in balancing the _______ she played both at home and in society.
A．characters
B．parts
C．performances
D．activities
直流斩波变流器的功能有哪些？
