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B 级合格证美 FCC 的计算机射频干扰 B 级限制，比 A 级标准更严格
telecom. Class B certification
A 级合格证美 FCC 的计算机射频干扰 A 级限制
telecom. Class A certification
级合格证
: 5 phrases in 4 subjects
Commerce2
General1
Mechanics1
Shipbuilding1

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