单项选择题

Maintenance activities include ______.
①making enhancements to software products
②developing a new software product
③correcting problems
④adapting products to new environments

A. ①②
B. ①③④
C. ②③④
D. ①②③④
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单项选择题
The basic unit of measure in a computer system is the ______. It is the smallest unit in computing. There are some other measures in a computer, such as Kilobyte, Megabyte, Gigabyte and so on.
A. KiloByte
B. bit

C. GigaByte
D. MegaByte
单项选择题
When a bridge transmits an Ethernet frame, the Ethernet frame has ______.
A. the broadcast address for the its source address
B. the bridge’s LAN address for its destination address
C. the bridge’s LAN address for its source address
D. none of the above
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