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[单选题]
GB5017 4£2008《电子信息系统机房设计规范》规定:A级和B级主机房的空气含尘浓度,在静态条件下测试,每升空气中大于或等于0.5μm的尘粒数应少于()。
A.18000粒
B.20000粒
C.30000粒
查看答案
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A.18000粒
B.20000粒
C.30000粒
A.-2
B.7.5
C.8
D.9.5
A.2.59
B.2.36
C.3.04
D.2.93
A.4
B.12
C.3
D.6
A.624
B.536
C.580
D.500
A.3 000
B.4 800
C.5 000
D.5 300
A.7.54
B.11.54
C.12.59
D.12.60
A.23
B.250
C.303
D.323