________, I couldn’t get the book I wanted.
A. Closed library
B. Library closed
Closing library
D. With library closing
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_____ the teacher told the class to go through the text.
A. Checking the answers
B. Checking the answers and
C. When checking the answers and
D. all the above
_______a rainy day, so all the farmers had to stay inside.
A. It being
Being
C. It was
D. all the above
根据STP协议,网桥ID最小的交换机被选举为根网桥,网桥ID由( )字节的优先级和6字节的MAC地址组成。
A. 2
B. 4
C. 6
D. 8
根据STP协议,网桥ID最小的交换机被选举为根网桥,网桥ID由2字节的优先级和6字节的( )组成。
A. 用户标识
B. MAC地址
C. IP地址
D. 端口号
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