转速负反馈单闭环调速系统中，系统对下列哪个量的变化引起的扰动具有调节能力?()

Most people (A) work to earn a living (B) and they produce goods and services(C). Services are such things like (D) education, medicine, and commerce. (选择有误的一项)

A、Most people
B、a living
C、goods and services
D、such things like

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