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【判断题】

铁路信号分为视觉信号和听觉信号。视觉信号基本颜色包括红色、黄色、绿色。

A.
正确
B.
错误
举报
参考答案:
参考解析:
.
刷刷题刷刷变学霸
举一反三

【单选题】视觉信号中红色表示()

A.
停车
B.
准备减速
C.
注意或减低速度
D.
按规定速度运行

【单选题】人的听觉产生于()

A.
听觉感受器
B.
耳蜗
C.
鼓膜
D.
大脑听觉中枢

【单选题】Every year television stations receive hundreds of complaints about the loudness of advertisements. However, federal rules forbid the practice of making ads louder than the programming. In addition, t...

A.
TV stations always operate at the highest sound levels
B.
their sound levels are kept around peak levels
C.
their sound levels are kept in the middle frequency ranges
D.
unlike regular programs their intensity of sound varies over a wide range