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Current measuring instruments must always be connected in ______.
A.series with a circuit
B.parallel with a circuit
C.series-parallel with a circuit
D.delta with the shunt
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单选题Current measuring instruments must always be connected in （）A
series with a circuitB
parallel with a circuitC
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delta with the shunt
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单选题Which statement concerning current is TRUE（）.A
Current can be determined by measuring the direction and distance between simultaneous EP and DR positionsB
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The distance between a simultaneous DR position and fix is equal to the drift of the current
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