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【单选题】
OSI模型中,实现节点到节点连接的层次是( )
A.
数据链路层
B.
网络层
C.
传输层
D.
应用层
拍照语音搜题，微信中搜索"皮皮学"使用
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举一反三
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【单选题】I _____ of your trying to earn some money, but please do not neglect your studies. [     ]
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promise
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【简答题】填写字母,完成单词拼写 1. inv____t
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【简答题】选择填空，补全单词。 (     ) 1. inv te (     ) 2. s ng (     ) 3. tod (     ) 4. br (     ) 5. t A. i A. b A. ey A. any A. oy B. a B. o B. ei B. ong B. ey C. e C. e C. ay C. ing C. oi
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【单选题】______we were worried about was ________they could manage to control the pollution.
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