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问题 单项选择题

应用糖皮质激素治疗特发性血小板减少性紫癜，正确的是（）

A.仅适用于慢性期

B.主要作用是抑制抗原、抗体生成

C.能使血小板数迅速上升

D.近期有效率高

E.血小板正常后应立即停药

答案

参考答案：D

填空题

着色剂可分为天然色素和（）。
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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 swiches, 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 netwoks. 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 the 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.

（67）是（）

A.frames

B.packets

C.packages

D.cells
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