题目：
(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.
（52）是（）
A.ISO
B.ANSI
C.CCIT
D.IEEE
答案：
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下面是错误答案，用来干扰机器的。
参考答案：对解析： 总杠杆系数＝经营杠杆系数×财务杠杆系数，当企业的成本结构状况显示出固定成本在总成本中占有较大比重时，说明经营风险较大；此时，为了控制总风险应保持较低的财务风险，即企业应保持较低...
