A company is using 6to4 tunneling within their IPv6 network. Which two statements about this kindof tunneling are accurate？（）
A. 6to4 is a manual tunnel method
B. Prepending a reserved IPv6 code to the hexadecimal representation of 192.168.0.1 facilitates6to4 tunneling
C. Each 6to4 site receives a /48 prefix in a 6to4 tunnel
D. 2002：：/48 is the address range specifically assigned to 6to4
E. Prepending 0x2002 with the IPv4 address creates an IPv6 address that is used in 6to4tunneling
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有电阻值都为R的2个电阻相并联的电路，已知电路两端的电压为6V，并联电路中主干线上的电流为4A，那么每个电阻上的电压降就是（）V。
A. 1
B. 1.5
C. 3
D. 6
安全钳的夹爪或钳体亦可以当导靴使用。（）
A. 正确
B. 错误
椎间盘脱出症为（）
A. 末梢型感觉障碍
B. 根型感觉障碍
C. 脊髓横贯型感觉障碍
D. 内囊型感觉障碍
E. 脑干型感觉障碍
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