Maintenance activities do not include （）.

单项选择题A 10BaseT Ethernet LAN has （）．

A．a star topology
B．a ring topology
C．a bus topology
D．a linear topology

单项选择题The prototyping method is a dynamic design processes, which requires people who use prototyping method to have the following capability of （）.

A．proficient program expertise
B．immediately acquire requirement
C．coordinate organize eloquently
D．handle tools smartly