浏览用户比率这个指标一定程度上衡量网页的吸引程度。
参考答案：对
下列逻辑地址中对应不同的物理地址的是( )。
A．400：340H
B．420：140H
C．3ED:740H
D．3C0:740H
Apart from its impact on commercial and industrial structures and procedures, the rapid development of the global communications system is apparently ______ barriers between peoples at a pace neither governments nor international agencies can hope to control.
A．setting up
B．triggering off
C．breaking up
D．breaking down.
