计算机网络系统接地要求小于（）。
A.4Ω
B.10Ω
C.5Ω
D.3Ω
参考答案：A
（2011•广州）若a＜c＜0＜b，则abc与0的大小关系是（ ）
A．abc＜0
B．abc=0
C．abc＞0
D．无法确定
________ the Internet is bridging the distance between people, it may also be breaking some homes
or will cause other family problems. [ ]
A. When
B. If
C. While
D. As
