设N_A为阿伏加德罗常数的值，下列叙述正确的是( )

A．标准状况下，将22.4L氯化氢溶于足量水中，溶液中含有的HCl分子数为N_A

B．常温常压下，16g¹⁴CH₄所含中子数目为8N_A

C．常温常压下，Na₂O₂与足量H₂O反应，共生成0.2molO₂，转移电子的数目为0.4N_A

D．标准状况下，22.4L空气含有N_A个单质分子

An internet is a combination of networks connected by (26) ．When a datagram goes from a source to a (27) ，it will probably pass many (28) until it reaches the router attached to the destination network．A router receives a (29) from a network and passes it to another network．A router is usually attached to several networks．When it receives a packet，to which network should it pass the packet The decision is based on optimization：Which of the available (30) is the optimum pathway

A．pathways

B．routers

C．diagrams

D．calls