单选题The set of the current is the（）.Aspeed of the current at a particular timeBmaximum speed of the currentCdirection from which the current flowsDdirection in which the current flows
单选题
The set of the current is the（）.
A
speed of the current at a particular time
B
maximum speed of the current
C
direction from which the current flows
D
direction in which the current flows
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