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问题 单项选择题

所谓全过程控制，要求从( )就开始进行投资控制，并将投资控制工作贯穿于建设工程实施的全过程。

A．决策阶段
B．设计阶段
C．招标阶段
D．施工阶段

答案

参考答案：B

选择题

将Cu、Cu2O和 CuO均匀混合物分成两等份，其中一份用足量的CO还原，测得反应后固体质量减少6.4g，另一份中加入150mL某浓度的硝酸，固体恰好完全溶解，且同时收集到标准状况下NOX气体6.72L，则所用硝酸的物质的量浓度可能为

A．8.0mol·L-1

B．9.0mol·L-1

C．10.0mol·L-1

D．11.0mol·L-1
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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（4）处应选择（）

A.connections

B.resources.

C.bridges

D.routers
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