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【多选题】
有关时间常数T,下列说法正确的是( )A.
当对象受到阶跃输入后，被控变量达到新的稳态值的63.2％所需的时间，就是时间常数
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，达到新稳态值所需的时间就是时间常数
C.
时间常数越大，表示在阶跃输入的作用下，达到新稳定值所需的时间越长。
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【单选题】下面( )不是document对象的方法.
A.
getElementByName();
B.
getElementById();
C.
write()
D.
reload()
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