J76、对GIS新的气体质量标准规定的纯度为 ( )
2023-06-23
(A)纯度(m/m)>96%
(B)纯度(m/m)≥97%
(C)纯度(m/m)≥99.8 %
(D)纯度(m/m)>99%
参考答案:C
(B)纯度(m/m)≥97%
(C)纯度(m/m)≥99.8 %
(D)纯度(m/m)>99%
参考答案:C
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2023-06-23
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