（1）下列物质中，互为同分异构体的有______，互为同素异形体的有______，属于同位素的有______，属于同一种物质的有______．（填序号）

①液氯  ②

 ③白磷     ④氯气

⑤

 ⑥氯水   ⑦¹²C

⑧¹⁴C                 ⑨₁₇³⁵Cl ⑩红磷 11   ₁₇³⁷Cl

（2）写出电子数为10的分子（5个）______．（填分子式）

A glue that holds the whole Internet together is the network layer protocol, ___35___. Unlike most older network layer protocols, it was designed from the beginning with internet working in mind. Its job is to provide a-___36___ way to transport datagrams from source to destination, without regard to whether these machines are on the same network or whether there are other networks in between them.

Communication in the Internet works as follows. The ___37___.layer takes data streams and breaks them up into datagrams. Each datagram is transmitted through the Internet, possibly being fragmented into smaller units as it goes. When all the pieces finally get to the destination machine, they are reassembled by the ___38___ layer into the original datagram. This datagram is then handed to the transport layer, which inserts it into the receiving process input stream.

An IP datagram consists of a header part and a text part. The header has ___39___ part and a variable length optional part.

37（）

A.data link 

B.transport 

C.network 

D.Application