何为第一远离、第二远离？
参考答案：
指自动闭塞区段以出站信号机为始点，经过的第一个闭塞分区的通过信号称之为第一离去，依次个闭塞分区的通过信号为第二离去。
固定性湿哕音
A．支气管哮喘B．支气管扩张C．慢性支气管炎、肺气肿D．支气管肺癌E．特发性肺间质纤维化
I ________ to go for a walk, but someone called and I couldn't get away. [ ]
A. was planning
B. planned
C. had planned
D. would plan
