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85.下面有关自动控制的一些提法,哪一条在概念上是模糊的? A.自动调节又称自动控制。 B.自动监督系统包括自动测量和信号报警等,它是一个开环系统。 C.自动操纵系统包括程序控制和自动联锁系统,属于定性控制,是一个开环系统。 D.自动调节属于定量控制,它不一定是闭环系统。
85. Which of the following statements about automatic control is conceptually obscure? A. Automatic adjustment, also known as automatic control. B. Automatic supervision system includes automatic measurement and signal alarm, which is an open-loop system. C. Automatic control system includes program control and automatic interlocking system, belonging to qualitative control, is an open loop system. D. Automatic adjustment is a quantitative control, it is not necessarily closed-loop system.