题目内容

三极管具有放大作用，外部电压条件是正偏，反偏。

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listen to the conversation again and complete the conversation.Engineer 1: The 1____ for the new office building looks a little high.Engineer 2: Yeah, but our budget might not 2_ Engineer 1: Maybe we can make it cheaper. Let's look at some alternative 3Engineer 2: Okay. What materials are you thinking about changing?Engineer 1: Well, the estimate included 4 _ __Engineer 2: What's wrong with that? Porcelain tiles 5_ Engineer 1: But they're also really expensive. We could save money by getting 6_ ______ instead.Engineer 2: That's a good idea.

Listen to a conversation between two engineers. Choose the correct answers.

A. how expensive ceramic tiles are
B. why the budget is so low
C. which materials are affordable
D. where to buy cheaper materials

在T-SQL语言的命令格式中,( )表示内容是必选的。

A. < >
B. { }
C. [,…n]
D. [ ]

使用CREATE database语句建立的是( ).

A. 数据库
B. 表
C. 视图
D. 索引