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问题 单项选择题

220kV电力变压器例行试验时，油中溶解气体总烃（）应引起注意。

A.≥100ｕL/L

B.≥150ｕL/L

C.≥300ｕL/L

D.≥500ｕL/L

答案

参考答案：B

单项选择题

The presentation layer is concerned with the （） and semantics of the informationexchanged between two systems． The processes in two systems are usually exchanginginformation in the form. of character（）,numbers, and so on． The information should be changed to bit（）before ．being transmitted． Because different computers use different encoding systems, the presentation layer is responsible for（）between these different encoding methods． The presentation layer at the sender changes the information from its sender-dependent format into a common format． The presentation layer at the receiving machine changes the common format into its（）dependent format．

The processes in two systems are usually exchanginginformation in the form. of character（）,numbers, and so on．

A．numbers

B．functions

C．strings

D．Codes
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填空题

在Access数据库中，文本型字段和备注型字段可以用于保存______，数值型字段则只允许保存______。
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