在河边看到水中树的“倒影”,这是由于在水面处发生了( ) A.光的直线传播 B.

题型:选择题

问题:

在河边看到水中树的“倒影”,这是由于在水面处发生了(  )

A.光的直线传播

B.光的折射

C.光的反射

D.光的漫反射

考点:光的反射现象光的直线传播的应用光的折射现象
题型:选择题

国债的功能不包括()

A.弥补财政赤字

B.筹集建设资金

C.补充国内建设资金的不足,加速本国的经济建设

D.调节经济

题型:选择题

用化学符号填空:

2个氮原子______________;

2个氧分子______________;

2个镁离子____________

+2价的钙元素________________。

题型:选择题

对水敏性地层,含一定量K﹢的钻井液有利于防塌。

题型:选择题

下列内容中,代表东方文化成就的有()

①《荷马史诗》

②《俄狄浦斯王》

③《天方夜谭》

④麦加清真寺

⑤巴黎圣母院

A.①③④

B.①②③④

C.③④

D.①②④

题型:选择题

Object-oriented DBMS integrated a variety of (81) data types-such as business procedures, graphics, pictures, voice and annotated text.

Object orientation also makes a (82) to application development efficiency. It makes the data, functions, attributes, and relationships an integral part of the (83) . In this way, objects can be reused and replicated.

Some leading RDBMS vendors support the concept of integrating object management capabilities with their current line of relational products. That capability enable users to the development cycle, since integrity logic and business roles no longer need to be programmed (84) each application.

(84)是()

A.tool

B.in

C.idea

D.contribution

E.joke

F.short

G.object

H.theoretical

I.extent

J.shorten

K.real-world

L.into

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