TCP (Transmission Control Protocol) was specifically designed to provide a reliable end-to-end byte stream over a(n)（）.

A．IP address

B．reliable network

C．socket

D．unreliable internet work

BH006清管器（球）发生卡堵时，可根据末端风量大小确定卡堵原因，如风量很（），说明清器（球）已经兜不住风，可重投入橡胶球继续进行。

A.大

B.小

C.少

D.弱