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问题 单项选择题

能够使用“输入掩码向导”创建输入掩码的字段类型是( )。

A．数字和文本

B．文本和备注

C．数字和日期/时间

D．文本和日期/时间

答案

参考答案：D

解析： 本题考查字段属性的知识。在设计字段的时候可以使用输入掩码来使得输入的格式标准保持一致，虽然对于大多数数据类型都可以设计输入掩码，但是只有“文本”型和“日期/时间”型字段才可以使用“输入掩码向导”。

单项选择题

手动草坪打孔机采用的刀具一般为（）。

A、扁平深穿刺刀

B、空心锥管刀

C、注射器

D、扁平切根刀
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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 (71) 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 (72) ，examine the MAC address and forward the frames to a different network while doing minor protocol translation in the process in me network layer，we have routers that can connect two networks，If two networks have (73) network layer，the router may be able to translate betweenthe 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 (74) ．As an example，gateways between Internet e-mail and X，400 e-mail must (75) thee-mail message and change various header fields．

A．analyze

B．parse

C．delete

D．create
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