专利类型分为（）
A.发明
B.实用新型
C.外观设计
D.发明、实用新型
E.发明、实用新型、外观设计
参考答案：E
Man: Have you run up against any problems in getting your passport renewedWoman: I haven't started the plan yet.Question: What do know from the conversation
A．The woman doesn't think it a problem to get her passport renewed.
B．The woman has difficulty renewing her passport.
C．The woman hasn't renewed her passport yet.
D．The woman's passport is still valid.
如果要建立一个20台微机组成的局域网， (245) 的费用最少，采用HUB和双绞线进行连接，使用的网络拓扑结构是 (246) ，HUB与微机工作站之间的最长距离为 (247) 米。
A．令牌总线网 B．令牌环网 C．以太网 D．双总线网
