单项选择题
设集合A={1,2},R = {|x,y A且x+y<3},则R在A上是
A.自反的,但不是对称的
B.自反的,又是对称的
C.对称的,但不是自反的
D.不是自反的,也不是对称的
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单项选择题
To accommodate the longest path allowed by 802.3,the slot time has been set to 512 bit times,or
A.0.512μs
B.5.12μs
C.51.2μs
D.512μs
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单项选择题
TCP(Transmission Control Protocol) was specifically designed to provide a reliable end-to-end byte stream over a(n)
A.IP address
B.reliable network
C.socket
D.unreliable internetwork
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