单项选择题
A.1B.2C.3D.4
A.5minB.10minC.15minD.20min
A.±5%，≤4%，≤4%B.±5%，≤2%，≤2%C.±15%，≤4%，≤4%D.±15%，≤2%，≤2%
A.±5%B.±10%C.±15%D.±20%
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