器官淤血的病理变化是

A．器官肿胀，暗紫红色，包膜紧张

B．器官发白，渗出液增多

C．体积增大，温度高

D．体积缩小，红润

E．炎症反应

SDLC was invented by IBM to replace the older Bisynchronous protocol for wide area connections between IBM equipment. A varietion of the (71) protocol called NRM is essentially the same as SDLC. SDLC is (72) protocol like HDLC, Frame Relay or X.25.An SDLC network is made up of (73) that controls all communications, and (74) . It is capable of (75) operation, but almost all practical applications are strictly half duplex.

（73）是（）

A. a primary station

B. one or more primary stations

C. a secondary station

D. one or more secondary stations