单项选择题
When placed in a magnetic field, which of the materials listed will maintain the highest permeability?（）
A.Glass
B.Bakelite
C.Soft iron
D.Aluminum
点击查看答案&解析
相关考题
-
单项选择题
An ohmmeter can be used to measure（）
A.current flow in a circuit
B.voltage between two points in a circuit
C.circuit continuity
D.power -
单项选择题
The instantaneous reduction in voltage of an AC generator, resulting from an increase in load, and prior to the automatic voltage regulator correcting the situation, is called voltage （）.
A.droop
B.drop
C.dip
D.regulation -
单项选择题
If both the “high level” and “low level” alarms come on for the same address of a centralized control console, the most likely problem is a/an （）.
A.sensor failure
B.failed alarm
C.low level
D.extremely high level
