下列哪个属于航运企业本身特有的竞争力构成要素()。
A.是否赢利
B.市场占有率
C.货运质量的高低
D.品牌知名度
参考答案:C
Inside the computer, the operation system (of another software module called a data communication (71) )must decide which program will get control next. Each program remember, is associated (72) . a particular front -end port. If a program’s data have not yet reached its front - end buffer, there is no point giving that program control. Thus the data communication monitor sends its own (73) signal to the front -end devices next port is polled. Note that the (74) computer speed. The computer never has to wait for a terminal or a communication line. Instead, it is the expressive front - end processor that waits for the slower system (75) to respond.
(72)处填()。
A.with
B.on
C.in
D.upon
在Quidway路由器中的IPX协议支持()封装格式
A、Ethernet_II
B、Ethernet_snap
C、Ethernet_sap
D、Ethernet_802.2
E、Ethernet_802.3
F、Ethernet_802.5