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【简答题】

对讲系统分为 和 ,可视对讲又分 和 。

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参考答案:
参考解析:
.
刷刷题刷刷变学霸
举一反三

【多选题】关于使用总账系统制单,下列描述中正确的有( )。

A.
可查看任意科目的最新余额
B.
可控制操作员使用科目的权限
C.
凭证可按任意格式的文本文件引入和引出
D.
不能修改和删除其他子系统生成的凭证

【单选题】总线制楼宇对讲系统适用于 。

A.
多层住宅
B.
高层住宅
C.
别墅
D.
办公楼

【单选题】What is World English World English is a course in the English language. It is intended for students whose native lauguage is not English. It is a basic programme consisting of six stages. Each stage ...

A.
What is World English
B.
World English is a course in the English language. It is intended for students whose native lauguage is not English. It is a basic programme consisting of six stages. Each stage includes a Student Book, a Teacher’s Book, a Workbook, and cassette recordings. World English is further supported by separate books of readings, by tests, and by visual (可视的) aids.
C.
Who is World English for
D.
World English may be entered at any one of three different levels. The First Level, Books One and Two, is intended for students with little or no education in English. Books Three and Four make up the Second Level; they are suitable for students who have some knowledge of English. The Third Level, Books Five and Six, is intended for students who are concerned with improvement in the language.
E.
What does World English teach
F.
World English teaches four basic skills of language: listening, speaking, reading, and writing. At all levels, each skill is presented systematically. In the First Level, listening and speaking receive more attention. In the latter books, reading and writing become more important. However, reading and writing activities are presented even in Unit One of Book One; and listening and speaking exercises occur through Unit Ten of Book Six.

【多选题】电晕对系统的影响有()。

A.
损耗电功率
B.
改变线路参数
C.
对通讯有相当大的影响
D.
没有影响