frequency-shift system造句

例句与造句

1. The ministry of railway has developed two kinds of frequency - shift track circuits based on the primary 4 - information frequency - shift system : 18 - information frequency - shift auto - blocking track circuit made in china and um - 71 jointless track circuit made in france , and put them into use on some important lines . but at the mean while , the safety of running train becomes austerer and austerer
   铁道部根据我国国情,在原有4信息移频制式的基础上,研制开发了两种移频轨道电路:国产18信息移频自动闭塞系统和法国um - 71无绝缘轨道电路系统,并将其应用到我国部分主要线路上。
2. It's difficult to find frequency-shift system in a sentence. 用frequency-shift system造句挺难的