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当前学科：中级综合计量工
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测密度时规定用0.2分度全浸式水银温度计，器差为±0.2℃，查石油计量表油品20℃密度值产生的误差σa=（）.
A . 0.0007
B . 0.2
C . 0.04
D . 0.0009
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