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【单选题】
正规瞭望通常认为，除视觉、听觉瞭望外，还包括________。
A.
对船舶现有设备和仪器的有效使用
B.
守听VHF
C.
经常检查本船的号灯和号型是否正常显示
D.
以上均应包括
手机使用
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【单选题】Every year television stations receive hundreds of complaints about the loudness of advertisements. However, federal rules forbid the practice of 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
【单选题】光一般是指能引起视觉的电磁波，其波长范围在（）之间
A.
0.78m～0.38m
B.
0.78nm～0.38nm
C.
0.78μm～0.38μm
D.
0.78Km～0.38Km
相关题目：
【单选题】Every year television stations receive hundreds of complaints about the loudness of advertisements. However, federal rules forbid the practice of 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
【单选题】光一般是指能引起视觉的电磁波，其波长范围在（）之间
A.
0.78m～0.38m
B.
0.78nm～0.38nm
C.
0.78μm～0.38μm
D.
0.78Km～0.38Km
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