管线泄漏一般的处理方法有打卡子、包焊或停用处理。

热轧带肋钢筋的强度标准值系根据屈服强度确定，用f_stk表示。( )

车辆适用的车船税税率形式是（）。

A.比例税率

B.超额累进税率

C.超率累进税率

D.定额税率

客户服务，是指确定的社会组织通过一定方式与相关的社会公众进行沟通而产生的相互之间的关系。据此，我们可以知道客户服务的元素包括：（）、（）。

TCP functions at the Open System Interconnection (OSI) (61) layer, or Layer 4. Its chief responsibility is to ensure (62) end-to-end connectivity. IP, located one layer down, at the OSI network layer, or Layer 3, communicates the addresses of each (63) sender and receiver to the routers along the way. Routers and Layer 3 switches can read IP and other Layer 3 (64) . This information, combined with routing tables and other network intelligence, is all it takes to get (65) the room or around the world via TCP/IP.

A．packet

B．packets

C．packet’s

D．packets’

活性炭是极性的吸附剂，可以在极性溶液中吸附非极性或极性小的物质。