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【单选题】
传输层传输的数据单元是（ ）。A.
比特（bit）
B.
数据帧（frame）
C.
数据包（packet）
D.
数据段（segment）
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皮皮学刷刷变学霸
举一反三
【单选题】Why does Maggie like to meditate?
A.
Because she has a really nice instructor.
B.
Because she thinks it’s really peaceful.
C.
Because she wants to keep pace with the world.
D.
Because she wants to escape from stress.
【单选题】--- What does Maggie look like? --- _________
A.
She looks very well.
B.
She likes parties a lot.
C.
She likes her mother.
D.
She is tall and pretty.
【简答题】哥特式建筑的主要特征是什么?
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