单项选择题
A.collect all available data on a casualty
B.recognize normal operation
C.identify the probable cause of a symptom
D.isolate the faulty component
单项选择题 An electrical device which employs a stationary armature and a rotating electromagnetic field is used aboard ship as a （）.
单项选择题 As a general rule, the first troubleshooting action to be taken in checking faulty electric control devices is to （）.
单项选择题 A circuit breaker differs from a fuse in that a circuit breaker （）.