单选题If a voltmeter is connected across a line, it must be protected with a（）AshuntBhigh-resistance coil in the armature circuitClow-resistance coil in the armature circuitDshunt and a coil of high resistance
单选题
If a voltmeter is connected across a line, it must be protected with a（）
A
shunt
B
high-resistance coil in the armature circuit
C
low-resistance coil in the armature circuit
D
shunt and a coil of high resistance
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