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【单选题】
在FX系列PLC中,状态元件S20—S499的用途及特点是( )。A.
用作状态转移图的初始状态
B.
在多运行模式控制当中，用作返回的状态
C.
用作状态转移图的中间状态，表示工作状态
D.
用作报警元件
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反馈参考答案：
举一反三
【单选题】支持SQL Server 2000中的所有可用功能，可作为企业数据库服务器使用的SQL Serve2000版本是——。
A.
SQL Server 2000个人版
B.
SQtL Server 2000企业版
C.
SQL Server 2000开发版
D.
SQL Server 2000标准版
【简答题】SQL Serve数据库文件有哪几种类型?其扩展名是什么?简述它们的作用。
【判断题】Compared with Chinese, English sentences are loose, various, flexible and have more minor sentences or simple sentences.
A.
正确
B.
错误
【判断题】Variety is achieved when short sentences are used in between long ones, simple sentences in between compound and complex ones, periodic sentences in between loose ones, but it is not to be sought for ...
A.
正确
B.
错误
【判断题】There are basically four kinds of sentences determined by sentence functions, they are simple sentences, compound sentences, complex sentences and compound-complex sentences.
A.
正确
B.
错误
【单选题】In order to achieve sentence variety, we could use different sentence structures, which means simple sentences are used in between _____.
A.
compound and complex sentences
B.
short and long sentences
C.
easy and difficult sentences
D.
questions and exclamations
【判断题】Short simple sentences are often used to make emphatic or important statements while long complex sentences express complex ideas clearly and accurately.
A.
正确
B.
错误
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