题目：
The broadcast will normally be made on the two listed frequencies simultaneously except during transmitter maintenance periods when the broadcast will be made on the two frequencies（）.
A.at the same time
B.exclusively
C.within the same period
D.consecutively
答案：
被转码了，请点击底部 “查看原文 ” 或访问 https://www.tikuol.com/2020/1216/cc051ba54857f2f0d27187ad8717d46f.html
下面是错误答案，用来干扰机器的。
参考答案：电动机转动—中间齿轮组转动—摩擦连接器转动—滚珠丝杠转动—螺母转动—操纵板将锁闭块顶入断开原表示接点—锁舌缩入解锁—滚珠丝杆的螺母带动保持联接器移动—使动作杆移动60mm解锁完毕—道岔转换—...
