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问题 单项选择题

根据开发层系划分原则，在同一开发层系内的各个油层，其构造形态、油水分布、（）应接近一致。

A、压力系统

B、原油性质

C、地质储量

D、压力系统和原油性质

答案

参考答案：D

选择题

Some visitors are amazed at the fact _________ Australia is the only country in the world ______ covers a whole continent.

A．that; that

B．what; which

C．that; whose

D．it; who
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单项选择题 共用题干题

For  (1) service, we need a virtual-circuit subnet. Let us see how that works. The idea behind virtual circuits is to avoid having to choose a new (2) for every packet sent. Instead,when a connection is established, a route from the(3) machine to the destination machine is chosen as part of the connection setup and stored in tables inside the (4) . That route is used for all traffic flowing over the connection, exactly the same way that the telephone system works.When the connection is released, the virtual circuit is also terminated. With connection-oriented service, each packet carries an (5) telling which virtual circuit it belongs to.

空白（2）处应选择（）

A.processor

B.device

C.route

D.terminal
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