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【单选题】
当控制系统接受一个输入量后，对输出量进行检测和反馈，计算实际输出结果和目标输出结果之间的偏差，并将计算偏差通过某种途径变换后反馈回输入端，以抑制内部或外部扰动对输出量的影响，这就是（ ）控制系统。A.
开环
B.
闭环
C.
自动
D.
机械
手机使用
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【简答题】How is Robin? [ A] Robin is busy. [ B ] Robin is sick. [ C]Robin is very well.
【单选题】How close parents are to their chil dren ___a strong influence on the character of the children.
A.
have
B.
having
C.
has
D.
to have
【简答题】how to care for a sick dog?
【单选题】Researchers counted how many volunteers got sick. They found that ________.
A.
no one in either group got sick
B.
people in both groups got sick a lot
C.
the group that took vitamin C was healthier
D.
the two groups got about the same number of colds
【简答题】滚法动作要领:手微屈,呈_______状,肘关节微屈 _______左右, _______吸定皮肤滚动。
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