当受地形限制,室外安装通信线路的塑料管道的路由无法取直或避让地下障碍物时,可敷设弯管道,其弯曲的曲率半径不得小于()m。
A、4
B、8
C、10
D、15
参考答案:D
–Why isn’t your brother good at math?
-- Because he thinks math is __________ than any other subject.
A.difficult
B.much difficult
C.more difficult
D.the most difficult
人工解锁SⅡ至北京方面发车进路,由()使SⅡXJJ复原落下,由()使SⅡQJ复原落下。