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问题 选择题

标准状况下，将一盛满HCl的试管倒置于水槽中，液体最终充满整个试管，假定溶质不扩散，则试管内盐酸的浓度为（　　）

A．0.045mol．L-1

B．1.00mol．L-1

C．0.029mol．L-1

D．无法确定

答案

设试管的容积为VL，则HCl气体的体积为VL，

标准状况下，n（HCl）=

V
22.4
mol，

液体最终充满整个试管，假定溶质不扩散，溶液的体积为VL，

则c=

V
22.4
V
=
1
22.4
mol/L=0.045mol/L，

故选A．

单项选择题

Networks can be interconnected by different devices．In the physical layer，networks can be connected by (66) or Hubs, which just move the bits from one network to an identical net-work. One layer up we find bridgas and swiehes, which operate at data link layer. They can accept (67) , examine the MAC address, and forward the frames to a different network while doing minor protocol translation in the process. In the network layer, we have routers that can connect two netwoks. If two networks have (68) network layer, the router may be able to translate between the packet formats. In the transport layer we find transport gateway, which can interface between the two transport connections. Finally, in the application layer, application gateways translate message
(69) . As an example, gateways between Internet e-mail and X.400 e-mail must (70) the e-mail message and change various header fields.

A．syntax

B．semantics

C．languages

D．format
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多项选择题

下列情形中，注册会计师应当视为被审计单位财务报告内部控制存在重大缺陷的迹象的有（）

A.注册会计师发现涉及被审计单位总经理的小额舞弊行为

B.被审计单位重述以前公布的财务报表，以更正由于错误导致的重大错报

C.注册会计师在审计过程中发现当期财务报表存在重大错报，而被审计单位的内部控制在运行过程中未能发现该错报

D.被审计单位的审计委员会对内部控制的监督无效
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