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问题 单项选择题

流感嗜血杆菌最好在哪种环境中进行初次分离培养

A．厌氧环境

B．微需氧环境

C．5%～10%CO2环境

D．空气中

E．50%CO2环境

答案

参考答案：C

解析：5%～10%CO：可促进流感嗜血杆菌的生长。

单项选择题 B型题

PNF操作技术中，"特点为一组肌群的向心性、离心性与固定性收缩组合，而无放松"属于（）。

A.等张组合

B.节律性起始

C.拮抗肌动态反转

D.拮抗肌节律性稳定

E.拮抗肌稳定性反转
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单项选择题

Networks can be interconnected by different devices. In the physical layer, networks can be connected by （66） or hubs, which just move the bits from one network to an identical network. One layer up we find bridges and switches, which operate at data link layer. They can accept （67） , examine the MAC address, and forward the frames to a different network while doing minor protocol translation in the process. In the network layer, we have routers that can connect two networks. If two networks have （68） network layer, the router may be able to translate between the packet formats. In the transport layer we find transport gateway, which can interface between two transport connections. Finally, in the application layer, application gateways translate message （69） . As an example, gateways between Internet e-mail and X.400 e-mail must （70） the e-mail message and change various header fields.

（70）处填（）。

A．analyze

B．parse

C．delete

D．create
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