（）车站通过DIB板采集信号联锁设备的状态信息。
A.微机联锁
B.继电联锁
C.电锁器联锁
D.一般中间站
参考答案：B
—How long have you _________ the book?
—For several weeks. [ ]
A. bought
B. borrowed
C. lent
D. had
两个数的公倍数的个数是无限的。[ ]
