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【单选题】
OSI 应用层有何作用?A.
提供数据分段
B.
提供数据加密和转换
C.
提供网络任意终端上应用程序之间的接口
D.
对源设备和目的设备之间流经的所有数据提供控制
拍照语音搜题，微信中搜索"皮皮学"使用
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皮皮学刷刷变学霸
举一反三
【单选题】—Lily dances so well . Where was she trained? —She learns all by herself .She _______goes to any training class.
A.
usually
B.
often
C.
even
D.
never
【单选题】She found that she herself couldn't do all the housework, so she hired a ______.
A.
guide
B.
clerk
C.
maid
D.
chief
【简答题】She was so angry at all ________ he was doing ________ she walked out without saying a word. [A] that that [B] which that [C] what as [D] that which
【简答题】以下关于线性组织结构模式的描述中，正确的有（ ）。
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