皮皮学，免费搜题
登录
搜题
【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
拍照语音搜题，微信中搜索"皮皮学"使用
参考答案：
参考解析：
知识点：
皮皮学刷刷变学霸
举一反三
【简答题】mother needed help. So I helped them going to 82
【简答题】机动车辆保险的特点有哪些?
【单选题】'To help out' means 'to volunteer' or to give help where it ? [ ]
A.
need
B.
to need
C.
is needed
【简答题】The media can often help solve problems and _____ attention to situations ______ help is needed. A．take; which B．draw; where C．pay; that D．draw; /
【简答题】汽车保险的特点有哪些?
【单选题】The Grandfather needed the girl to help because ().
A.
of the darkness
B.
of the heavy rain
C.
of his blindness
D.
the job needed at least two people
【简答题】Sometimes a doctor is needed to help the child lessen the anxiety in such ways as ______.
相关题目：