高纯氮气纯度为（)%。

A、纯氮

B、高纯氮

C、工业氮

A.90.0%(体)

B.95%(体)

C.99.5%(体)

A.N2＞98.9%

B.N2＞99.0%

C.N2＞99.5%

D.N2＞99.9%

A.96.5%

B.97.5%

C.98.5%

D.99.5%

A.氮气纯度至少为99.5%

B.系统中氧含量至少为21%

C.系统中总烃含量最大为2000ppm

D.系统中环氧含量为0.3%

A、99.9

B、99.5

C、99

A.≥99.5%wt

B.≥99.5%vol

C.≥99.9%wt

D.≥99.9%vol

A.＞99.5%

B.＞99.9%

C.＞99.7%

D.＞99.6%

A.大于99.0%

B.大于99.9%

C.大于99.5%

D.大于95%