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在实际测量电流时，一定要断开电源，把电流表串入待测电路中（） When actually measuring the current, be sure to disconnect the supply and connect the ammeter in series with th memeasured branch
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考题
以下有关电流表的使用方法，说法正确的有（）。A、测量时是将电流表串联在电路中B、测量时是将电流表并联在电路中C、应使电流从电流表的正端流入，负端流出D、电流表的量程应大于被测电路中实际电流的数值
考题
单选题When measuring AC current flow, you must always connect the meter （）A
in series with the power source and loadB
in parallel with the power source and loadC
insuring correct polarityD
using the lowest range possible to prevent instrument damage
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