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问题 多项选择题

利用回归分析得出的估计方程具有很强的时效性原因有( )。

A．市场兴趣的变化

B．数据值的变化

C．尚有该模型没有捕捉到的其他重要因素

D．数据取样不准确

答案

参考答案：A,B,C

单项选择题

For each blank, choose the best answer from the four choices and write down on the answer sheet.
(21) 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.
(22) is a professional organization of individuals in multiple professions which focuses on effort on lower-layer protocols.
(23) functions with two layers of protocols. It can connect networks of different speeds and can be adapted to an environment as it expands.
(24) is the popular LAN developed under the direction of the IEEE802.5.
(25) 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.

A．Ethernet

B．Token Bus

C．Token Ring

D．DQDB
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单项选择题 A1型题

照海穴的主治病证是（）

A.胁肋胀痛

B.咽喉干痛

C.下肢厥冷

D.慢性腹泻

E.胸闷不舒
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