A、A.obscured
B、B.darkened
C、C.greyed
D、D.delighted
更多“Sometimes lights are（）by fog，haze，dust，smoke，or precipitation which may be present at the light，or between the light and the observer，and which is possibly unknown by the observer.”相关的问题
A、the period of darkness exceeds the period of light B、there is only a partial eclipse of the light C、the periods of light and darkness are equal D、the period of light exceeds the period of darkness
A、the period of darkness exceeds the period of light B、there is only a partial eclipse of the light C、the periods of light and darkness are equal D、the period of light exceeds the period of darkness
A、A.Three white lights in a vertical line are lit B、B.A red light starts to flash at about 60 times a minute C、C.A yellow light is illuminated on the bridge pier D、D.There is a range of green lights under the lift span
A、Two masthead lights B、One masthead light and a sidelight C、Both sidelights D、Stern light only
A、A.Megohm meter, insulation light and synchroscope B、B.Synchroscope, synchro light and megohm meter C、C.Shore power switch, insulation light and synchroscope D、D.Megohm meter, insulation light and shore power switch
A、white lights are not used B、red and green lights are not used C、the signal cannot be mistaken for a signal authorized by the Rules D、the vessel signals such intentions over the radiotelephone
A、are not the same color as either side light B、have a lesser range of visibility than the prescribed lights C、do not impair the visibility or distinctive character of the prescribed lights D、All of the above
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