单项选择题
A.0.866倍 B.1倍 C.1.15倍 D.0.707倍
A.±0.1% B.±0.2% C.±0.5% D.±1.0%
A.67% B.50% C.30% D.20%
A.5A B.1A C.0.5A D.不确定
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