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【多选题】
1 # 下列关于增益自适应预估补偿控制方案 的 描述 中, 正确的 有 ( )。A.
使预估器的增益可根据预估模型和系统输出的比值 具 有相应的校正值；
B.
过程 的输出 响应一般都比 Smith 预估器要好；
C.
当 模型纯滞后比 过程纯滞后偏大时，增益自适应补偿效果也不佳；
D.
与 Smith 预估器 的 结构相似 ，仅是由减法、加法运算分别改为了除法、乘法运算 。
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举一反三
【单选题】She is a hardworking student, and all her spare time she has ________ staying in the library.
A.
spent
B.
is spent
C.
to spend
D.
to be spent
【简答题】A．She spent most of her time under the sea. B．She spent most of her time lying in the sun. C．She spent most of her time looking for sunken treasure. D．She spent most of her time taking photographs of ...
【简答题】Before she went abroad she spent as much time as she could ________ English. [A] practise to speak [B] practising speaking [C] practise speaking [D] to practise speaking
【单选题】关于量具的选择以下说法错误的是:
A.
单件小批生产应广泛采用通用量具，如游标卡尺、百分表和千分尺。
B.
大批大量生产应采用极限量块和高效的专用检验夹具和量仪等。
C.
大批大量生产应采用通用量具。
D.
量具的精度必须与加工精度相适应。
【简答题】A．She spent most of her time under the sea. B．She spent most of her time lying in the sun. C．She Spent most of her time looking for sunken treasure. D．She spent most of her time taking photographs of ...
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