d. c.造句

position control of d. c. motors has been done by means of pulse width modulation .
直流电机位置用脉冲宽度调制法控制。
if an induction resolver is used then some electronic circuitry will be required to convert the resolver outputs to d. c. signals .
假如采用感应式分解器，那么就需要采用某种电子线路来把分解器的输出转换成直流信号。
It's difficult to find d. c. in a sentence. 用d. c.造句挺难的