2.A级洁净工作区中 ≥5μm动态悬浮粒子最大允许数为A.5个/米3B.4个/米3C.3个/米3D

2.A级洁净工作区中，≥5μm动态悬浮粒子最大允许数为

A.5个/米3

B.4个/米3

C.3个/米3

D.2个/米3

E.1个/米3