前置胎盘剖宫产时需切除子宫的依据不包括（）

A.子宫下段糜烂性出血，缝合止血无效

B.胎盘植入，子宫出血不止

C.加压血时患者血压仍进行性下降

D.子宫下段活动性出血，接产单位为基层医院，血源紧张

E.无再产育要求

SOCKS is a genetic proxy protocol for TCP/IP-based networking, applications. SOCKS includes two (21) , the SOCKS server and the SOCKS client. The SOCKS server is implemented at the application layer. The SOCKS client is implemented between applications and the (22) layer. When an application client needs to connect to an application server, the client connects to a SOCKS proxy server. The proxy server connects to the application server instead of the client, and (23) data between the client and the application server. For the application server, the proxy server is the (24) . SOCKS is also one of the popular (25) to network firewalls. Because of its simplicity and flexibility, SOCKS has been used as genetic application proxy in virtual private network (VPN), and for extranet applications.

A．transport

B．transmission

C．network

D．datalink