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【单选题】
在定值控制系统中，其控制作用是（）A.
给定值随工况变化，被控量也跟着变化
B.
给定值不变，被控量也始终不变
C.
被控量能尽快地恢复到给定值附近
D.
定值在一定范围变动，被控量在较小范围内变化
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【简答题】IA、IIA的同族元素,从上到下,电负性依次( );金属性依次( ) (填增大或减小)
【简答题】以下不属于机器损坏保险的保险责任的是（ ）。
【简答题】There was once a man in South America who had a parrot(鹦鹉), a pet bird that could imitate(模拟) human speech. The parrot was unique. There was no other bird like him in the whole world. He could learn t...
【简答题】IA、IIA的同族元素,从上到下,电负性依次( );金属性依次( )
【单选题】听力原文： There was once a man in South America who had a parrot, a pet bird that could imitate human speech. The parrot was unique. There was no bird like him in the whole world. He could learn to say an...
A.
Because the bird couldn't repeat his master's name.
B.
Because the bird screamed all day long.
C.
Because the bird uttered the wrong word.
D.
Because the bird failed to say the name of the town.
【多选题】以下属于机器损坏保险保险责任的是（）
A.
超负荷、超电压、漏电及其他电气原因造成的火灾或爆炸
B.
工人、技术人员的操作错误、疏忽过失、恶意行为
C.
离心力引起的断裂
D.
设计、制造错误和原材料缺陷
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