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
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
答
4个选项没有一个是正确的.应该是L/R、RC.