A.one nautical mile
B.two kilometers
C.5 cables only
D.one fathom
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A.a vessel arrives at a port in a evening
B.a vessel leaves a port in a evening
C.a vessel arrives at a port in a morning
D.a vessel leaves a port in a morning
A.by
B.with
C.on
D.in
A.cable areas
B.dumping grounds
C.fish trap areas
D.precautionary areas
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.After boarding the pilot
B.After the pilot leaving the ship
C.After the pilot going on board
D.After taking the pilot
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The distance between any two meridians measured along a parallel of latitude and expressed in miles is the （）.
A vessel not to impede the passage of another vessel is not relieved （） taking collision-avoiding action.
On a voyage from Capetown to London，the favorable ocean current off the coast of Africa is the （）.
Clearances of bridges and overhead cables below Bonneville Dam refer to heights in feet above mean （）.
The distance between the surface of the water and the tidal datum is the （）.
Attention is called to the fact that in many cases charted depths may be decreased by up to （）.
Conditions for crossing a rough bar are usually best at （）.
As these features are not all charted，special caution should be exercised （） vessels navigating in the vicinity.
A pilot vessel on pilotage duty shall show identity lights （）.
A pilot vessel on pilotage duty at night will show sidelights and a sternlight （）.