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单项选择题

交换机的数据帧转发方式有直通转发、存储转发和（ ）？ A.
全部转发 B.
被动转发 C.
免分片转发 D.
以上都不对

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单项选择题
It is important to remember that when the JFET is used as a voltage variable resistor, which is one of its practical applications, the voltage VDS is ________ VDS(max.and | VGS | is ________ |VP|. ____
A．very much greater than; very much greater than
B．very much less than; very much greater than
C．very much greater than; very much less than
D．very much less than; very much less than
单项选择题
坚持在发展中保障和改善民生， 最大的民生是就业。（   ）
A、正确
B、错误
单项选择题
The following table contains the probability distribution for X = the number of retransmissions necessary to successfully transmit a 1024K data package through a double satellite media.
 
X
0
1
2
3
P(X)
0.35
0.35
0.25
0.05
the standard deviation of the number of retransmissions is ________
A．0.894
B．1
C．0.799
D．3
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