词典
例句
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简体中文
class of service (COS)
class of service signal
class of service table
class of service table (COS table)
class of service tone
class of station
class of taxpayer
class of the field
class of track
参考
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Wikipedia
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class of service tone
➞
class of service tone
Definitions
[1]
[电]
服务分音类
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简体中文
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class of service tone