单项选择题
A.check for respiration B.check for pulse C.treat for shock D.All of the above
Tools with （）handles should be used to check electric c...
单项选择题Tools with （）handles should be used to check electric circuit.
A.plastic B.metal C.stainless steel D.copper
Before doing maintenance on electrical equipment, you s...
单项选择题Before doing maintenance on electrical equipment, you should （）.
A.turn off power first B.turn on power first C.with a test pen in hand D.tell C/E
While the parallel operation, （） must be used.A.ammeter...
单项选择题While the parallel operation, （） must be used.
A.ammeter B.voltmeter C.synchroscope D.A+B+C
