If a voltmeter is connected across a line, it must be protected with a（）<br>A:shunt<br>B:high-resistance coil in the armature circuit<br>C:low-resistance coil in the armature circuit<br>D:shunt and a coil of high resistance

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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