皮皮学，免费搜题
登录
搜题
【简答题】
当轨道电路完整并空闲时,轨道电路的工作状态为(),当轨道电路区段有车占用时,轨道电路的工作状态为()。
手机使用
分享
复制链接
新浪微博
分享QQ
微信扫一扫
反馈参考答案：
举一反三
【单选题】Not until the press reported the pollution _________ why the water supply had been cut off.
A.
people did know
B.
people had known
C.
did people know
D.
had people known
【多选题】Mark Twain had led an active life in the very center of the American experience. He had been a____________ .
A.
printer, pilot, soldier
B.
silver-minor, gold-washer
C.
lecturer, traveler, businessman
D.
novelist, autobiographer
【简答题】链传动的类型为传动链传动、（）、牵引链传动。
【单选题】Few people believed the dam had been burst because there had been too many false alarms.
A.
Y
B.
N
C.
NG
【简答题】链传动的类型为（）链传动、（）链传动、（）链传动。
【单选题】Fewer people would have died if______.
A.
more announcements had been made
B.
people hadn't used the lifts
C.
the people had obeyed the office
D.
the incident had happened on a weekend
【简答题】链传动的类型为传动链传动、起重链传动、（）。
相关题目：
参考解析：
知识点：
题目纠错 0
发布
