用于数据通信的双绞线一般分为五类,其中()用于电话线和低速数据线。
A.1类
B.2类
C.3类
D.4类
参考答案:A
已知A、B、C为直线m上的三点,线段AB=9cm,BC=1cm,那么A、C两点的距离是( )
A.8cm
B.9cm
C.10cm
D.8cm或10cm
Everyone Obama meets seems to be _________ with his pat-on-the-back signature.
A.awarded
B.rewarded
C.provided
D.familiar