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【简答题】
If the probability distribution of X is What is the expected value of X? What is the variance of X?
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【简答题】以下关于IPv4和IPv6的说法，错误的是（ ）。 A)IPv4存在局限性，所以人们开发了IPv6 B)IPv6依然沿用了IPv4的核心设计思想 C)IPv6在协议格式、地址表示法方面和IPv4是相同的 D)IPv6采用了128位地址长度
【单选题】对高分子溶液发生盐析，不正确的说法是( )
A.
加入大量电解质才能使大分子化合物从溶液中析出
B.
盐析过程与电解质用量无关
C.
盐析的机理包括电荷中和及去极化两个方面
D.
电解质离子的盐析能力与离子价态关系不大
【单选题】In the description of IPv4 address and IPv6 address, the correct one is ().
A.
IPv4 address and IPv6 address are 32 bits
B.
IPv4 address is 32 bits, IPv6 address is 128 bits
C.
IPv4 address and IPv6 address are 128 bits
D.
IPv4 address is 128 bits and IPv6 address is 32 bits
【单选题】Company network is implemting IPv6 into their existing IPv4 netwrok. Which statement is trueabout incorporating IPv6 into an already existing IPv4 network？（）
A.
Only OSPF version 3 can be utilized for routing IPv4 and IPv6
B.
IPv4 and IPv6 networks can be routed simultaneously
C.
IPv6 can be routed using the same routing protocol versions as IPv4
D.
A router routing for IPv6 and IPv4 must convert IPv4 packets to IPv6 packets to route them
E.
None of the other alternatives apply
【简答题】简述IPv6与IPv4相比，IPv6的主要变化。
【简答题】钢的热处理是通过例在固态合金下的( )、( )和( ),改变钢的内部组织,从改变其性能的工艺方法。
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