单项选择题
A.0.3m B.0.6m C.0.7m D.1m
A.7% B.10% C.5% D.6%
A.±5% B.±6% C.±7% D.±8%
A.＋7%，－10% B.－7%，＋10% C.±7% D.±10%
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