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【单选题】
以下关于局域网的描述中错误的是A.
覆盖有限的地理范围
B.
提供高数据传输速率（1.544～51.84Mbps）、低误码率的高质量数据传输环境
C.
一般属于一个单位所有，易于建立、维护和扩展
D.
决定性能的三个因素是：拓扑、传输介质与介质访问控制方法
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】—I'm sorry I stepped outside for a smoke. I was very tired. —There is no ______ for this while you are on duty.
A.
reason
B.
excuse
C.
explanation
D.
cause
【单选题】听力原文：M: I feel very ill, Doctor. W: What is the matter with you? M: I have a terrible sore throat. I have a headache, too. W: Have you been coughing and sneezing? M: I cough a lot, but I don't sneeze....
A.
Coffee.
B.
Hot tea.
C.
Pure water.
【单选题】听力原文：W: John, this new Walkman is absolutely wonderful. M: Yeah, I like it very much. W: Thank you for lending me this Walkman. M: Don't mention it. W: Where did you buy it? M: Tom and Jane bought it ...
A.
Teacher and student.
B.
Siblings.
C.
Friends.
D.
Relatives.
【简答题】（ ）是以天然或合成高分子物质为载体制成的载药微细粒子。
【单选题】听力原文：W: Your spoken English is very good. I like it very much. M: Thank you! You see, I've ever stayed in America for three years and during that time my oral English was improved a lot. Q: How long d...
A.
Two years.
B.
Three years.
C.
Four years.
D.
Five years.
【简答题】是以天然或合成高分子物质为载体制成的载药微细粒子。
【简答题】Happy Sunday I have four goldfishes in my room. They are very beautiful. I love them very much. On weekdays, I’m always busy. I must study and do homework and so on, so I have no time to care(照顾) them...
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