单项选择题
A.amount of temperature rise with no load
B.temperature of the compartment where the motor is located
C.normal operating temperature, less the room temperature
D.amount of temperature developed by an operating motor
单项选择题 You are attempting to parallel two AC generators and the synchroscope pointer is revolving in the slow directionThis indicates that the frequency of the incoming machine is （）.
单项选择题 The need for insulation cleaning may be determined by （）
单项选择题 Voltage will always lead current in a/an （）