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问题 单项选择题

我国于1990年12月30号颁布了《空气压缩机油》标准，以前的HS－13相当于新标准的（）油。

A.L-DAB46

B.L-DAB68

C.L-DAB150

D.L-DAB220

答案

参考答案：C

选择题

逆反心理和逆反行为[     ]

A．要具体分析，不能一概说是错的

B．往往保护了自己，却伤害了父母

C．是独立自主的表现，值得我们提倡

D．是对于父母错误管教的唯一反抗方式
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单项选择题

(51) is a six bytes OSI layer 2 address which is burned into every networking device that provides its unique identity for point to point communication.

(52) is a professional organization of individuals in multiple professions which focuses on effort on lower-layer protocols.

(53) functions with two layers of protocols. It can connect networks of different speeds and can be adapted to an environment as it expands.

(54) is the popular LAN developed under the direction of the IEEE802.5.

(55) is the popular backbone technology for transmitting information at high speed with a high level of fault tolerance which is developed under the direction of ANSI.

（51）是（）

A. The MAC address

B. The IP address

C. The subnet address

D. The virtual address
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