RL、RC电路的时间常数 分别等于( )

问题描述:

RL、RC电路的时间常数 分别等于( )
RL、RC电路的时间常数分别等于( )
A、R/L、RC
B、RL、RC
C、RL、R/C
D、R/L、R/C

4个选项没有一个是正确的.应该是L/R、RC.