单项选择题
A.1.5倍 B.2倍 C.2.5倍 D.3倍
A.分开 B.闭合 C.烧蚀 D.时闭时开
A.±3% B.±5% C.±10% D.±15%
A.3% B.5% C.10% D.15%
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