依《反补贴条例》的规定，我国反补贴调查期限，自立案调查决定公告之日起至最终裁定公告之

完成下列化学反应方程式，并指出其反应类型．

（1）镁在空气中燃烧：______，______；

（2）丙烷（C₃H₈）在氧气中完全燃烧：______

（3）加热氧化汞：______，______．

消声器的插入损失

反应深度提高，氧含量下降。

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（1）处应选择（）

A.connectionless

B.connection-oriented

C.datagram

D.telegram