洁净室及洁净区空气中悬浮粒子洁净度等级共划分为( )等级。
2023-05-13
A.6
B.9
C.10
D.12
参考答案:B
B.9
C.10
D.12
参考答案:B
2020版教材P151
(二)洁净度等级现行规范规定了N1至N9级的9个洁净度等级。
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