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Rail transport
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AAR Class
1
北美一级铁路公司
end
1
一位端
1
min power frequency withstanding voltage
1 分钟工频耐受电压
No.
1
position side
一位侧
1
st impedance stage
第一阻抗段
1
st limit
第一限度
User-to-User Signalling type
1
用户到用户信令类型 1
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