问答题

Modbus的数据通信采用通信方式？

答案：主从

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OTDR测量的是（），而不是传输信号的强弱。

答案：反射的能量

单项选择题

Which of the following angles between an electric dipole moment and an applied electric field will result in the most stable state?
A、0
B、
C、
D、The electric dipole moment is not stable under any condition in an applied electric field.