话务集中的思想就是将M条连通数字交换网络的话路分配给N条用户线共用，所以N∶M通常是（）
A.大于1
B.小于1
C.等于1
D.任意的
参考答案：A
Dissatisfied with his present condition, Peter wants to find another job _____ he could make use of what
he has learned. [ ]
A. which
B. when
C. that
D. where
中华人民共和国国歌的词曲作者（）
A．田汉，聂耳
B．乔羽，冼星海
C．李淑祥，黄自
