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问题
单项选择题
路由器属于OSI模型（）的设备。
A、物理层
B、数据链路层
C、网络层
D、传输层
答案
参考答案：C
选择题
The writer _____ his writing so that he forgot to have his lunch.
A. absorbed
B. was absorbed into
C. absorbed into
D. was absorbed in
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单项选择题
下列哪种物质不能作为混悬剂的助悬剂用
A．西黄蓍胶
B．海藻酸钠
C．硬脂酸钠
D．羧甲基纤维素
E．硅皂土
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