单项选择题
（） is the actual value of the controlled condition.
A.Desired value B.Set value C.Measured value D.Deviation
单项选择题 Which of the following marine examples belongs to the open loop control system?（）
单项选择题 The operation of （） two alternators requires the voltages to be equal and also in phase.
单项选择题 With a purely （） load the voltage and current are in phase, giving a power factor of one.
