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【多选题】
关于对象的时间常数,以下说法正确的是()。A.
当对象受到阶跃输入作用后，被控变量如果保持平均速度变化，达到新的稳态值所需的时间。
B.
当对象受到阶跃输入作用后，被控变量如果保持初始速度变化，达到新的稳态值所需的时间。
C.
当对象受到阶跃输入作用后，被控变量达到新的稳态值的 62.32% 所需的时间。
D.
当对象受到阶跃输入作用后，被控变量达到新的稳态值的 63.2% 所需的时间。
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举一反三
【简答题】蛤蚧的功效是
【简答题】Fill in the blanks with the words or expressions given. Change the form if necessary. rural widespread dramatic gain trend response promote po...
【单选题】Exercise 7 Choose the best answers in the blanks . 2. Some children learn ________ slower ________. It would be unfair to expect a child with learning difficulties to keep up with faste...
A.
at a rate
B.
rate
【简答题】Some parents insist that children learn good table ____at home.
【单选题】蛤蚧的功效是
A.
补肺气，助肾阳，定喘咳
B.
补肺气，助肾阳，益精血
C.
补肺气，定喘嗽，益精血
D.
助肾阳，定喘嗽，益精血
E.
补肺气，助肾阳，定喘嗽，益精血
【单选题】Some children learn _____ slower ___________. It would be unfair to expect a child with learning difficulties to keep up with faster learners.
A.
a great deal of
B.
for the purpose of
C.
at a....rate
D.
go down
【简答题】Let the children learn what all educated persons must some day learn， how to measure their own understanding， how to know what they know or do not know.
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