Which two statements describe characteristics of IPv6 unicast addressing?()
A. Global addresses start with 2000::/3.
B. Link-local addresses start with FE00:/12.
C. Link-local addresses start with FF00::/10.
D. There is only one loopback address and it is ::1.
E. If a global address is assigned to an interface, then that is the only allowable address for the interface.
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两轴转向架中各型轮对的轮缘厚度段修限度不小于()mm。
A. 31
B. 32
C. 33
D. 26
全国55个少数民族有50个集中分布在西部地区,西部少数民族人口占全国少数民族人口的()左右,因此,从一定意义上说,国家实施的西部大开发战略就是少数民族地区的大开发。
A. 75%
B. 64%
C. 60%
高炉大中修时如需要放残铁,则选择残铁口开孔的中心位置要()炉底侵蚀平面。
A. 稍高于
B. 正好对准
C. 稍低于