最常合并肺栓塞的是（） A.冠状动脉造影术 B.肾盂肾炎 C.房间隔缺损 D.浅静脉

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

筹资者在确定债券期限时，主要需要考虑的因素有( )。

A．偿还能力

B．市场利率变化

C．资金使用方向

D．债券变现能力

茶黄螨危害特点

棉包的排列原则是避免同一成分原料重复抓取，即排包时做到（），（）。