【单选题】A list signal of one white light indicates that the vessel is ().
B.
listing about 1° to the side the light is displayed on
C.
listing over 5° With the light displayed on the high side
D.
listing,and the chutes should be directed to the side where the light is displayed
【单选题】A vessel showing a yellow light over a white light at night is a vessel ().
【单选题】A vessel trawling will display a ______.
A.
red light over a white light
B.
green light over a white light
C.
yellow light over a red light
D.
white light over a green light
【单选题】A buoy marking a wreck will show a(an) ______.
A.
white light FL (2) and a topmark of 2 black spheres
B.
occulting green light and may be lettered
C.
yellow light and will be numbered
D.
continuous quick white light and may be numbered
【单选题】On a chart, the characteristic of the light on a lighthouse is shown as flashing white with a red sector. The red sector ______.
A.
indicates the limits of the navigable channel
B.
indicates a danger area
C.
is used to identify the characteristics of the light
D.
serves no significant purpose
【简答题】White light (4000Å~7000Å) falls on a soap bubble (thickness t=3000Å, n=1.3).Light at which wavelength is maximally strengthened in the reflecting light?λ = __________ Å
【多选题】signa l can be used in
【单选题】当NC故障排除后,按RESET键( )。
【单选题】A vessel showing a green light over a white light in a vertical line above the level of the sidelights is ______.
A.
engaged in underwater construction