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问题 单项选择题

CY/T5-1999中规定精细印刷品品红相对反差值为多少。（）

A、0.20～0.30

B、0.30～0.40

C、0.35～0.45

D、0.35～0.50

答案

参考答案：C

问答题 案例分析题

某患者，女，28岁，已婚。结婚3年．夫妇同居，未避孕不怀孕，男方检查正常。月经15岁初潮．周期正常，婚后月经逐渐后延，常2～3月一行，持续2～3天干净，血量较少。身体逐渐肥胖，近2年体重增加20余公斤，带下量多，质粘稠，胸闷泛恶，头晕心悸。舌质淡，苦自腻，脉滑。
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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 (31) 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 (32) , examine the MAC address and forward the frames to a different network while doing minor protocol translation in the process. In network layer, we have routers that can connect two networks. If two networks have (33) network layer, the muter may be able to translate between the packer 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 (34) . As an example, gateways between Internet e-mail and X.400 e-mail must (35) the e-mail message and change various header fields.

（33）是（）

A.special

B.dependent

C.similar

D.dissimilar
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