单项选择题
A.应用层B.表示层C.物理层D.互联层
A.ASN.1 B.BER C.Unicode D.base64 E.quoted-printable
A.D1 B.C1 C.C2 D.B1
A.connect B：/usr/lib/usr/lib B.ln B：/usr/lib/usr/lib C.mount B：/usr/lib/usr/lib D.mount A：/usr/lib B：/usr/lib
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