考虑到信号系统的安全性缘故，在系统中使用了（）个里程脉冲发生_爱下问搜题

搜题请搜索小程序“爱下问搜题”

问题填空题

考虑到信号系统的安全性缘故，在系统中使用了（）个里程脉冲发生器。

答案

参考答案：两

判断题

“株连”“诛九族”说明古人的复仇伦理。

单项选择题

Questions 24-30

·Look at the questions for this part.
·You will hear apassage about "A Little House in the Big Woods ". You will listen to it twice.
·For Questions 24-30, indicate which of the alternatives A, B, or C is the most appropriate response.
·Mark one letter A, B, or C on the Answer Sheet.

What sound frightened Laura at night

A．Howling wolves.

B．Barking dogs.

C．Pouring rain.