类别：
- AO
- AP
- API
- APN
- APNIC
- APS
- APT
- AR
- AR
- ARCNET
- ART
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- AS
- ASMP
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- AT
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- B2E
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- BB
- BB
- BCC
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- BCN
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- BEDO-DRAM
- BER
- BF
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- CA
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- CAT
- CAT
- CATS
- CAU
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