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【多选题】
无线接口信令自下而上分为哪几层?A.
物理层
B.
用户层
C.
数据链路层
D.
信令层
拍照语音搜题，微信中搜索"皮皮学"使用
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【单选题】A postage stamp's value to collectors is raised if ______.
A.
there are few others like it
B.
there are no errors on the stamps
C.
a mistake is made in the ,printing
D.
both A and C
【单选题】The stamps, once ____, will be very popular with stamp-collectors.
A.
being printed
B.
printing
C.
to print
D.
printed
【单选题】A postage stamp's value to collectors is raised if______.
A.
there are few others like it
B.
there are no errors on the stamp
C.
a mistake is made in the printing
D.
both A and C
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【单选题】Chinese New Year is on _____.
A.
the first day of the first lunar month
B.
the first day of the first new month
C.
the first day of the first month
D.
the first day
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