A.concealed
B.buried
C.existed
D.built
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A.one nautical mile
B.two kilometers
C.5 cables only
D.one fathom
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
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As these features are not all charted，special caution should be exercised （） vessels navigating in the vicinity.
For full information regarding the current circulation of the Indian Ocean,（） Sailing Direction,Current Atlas,etc.
A pilot vessel on pilotage duty shall show identity lights （）.
Attention is called to the fact that in many cases charted depths may be decreased by up to （）.
The height of eye correction is smaller than geometrical dip because of （）.
Due to lapse of time the risk in these areas to surface navigation is now considered （）than the ordinary risks of navigation，but a very real risk still exists with regard to anchoring，fishing or any form of submarine or seabed activity.
On a voyage from Halifax,N.S.,to Dakar,West Africa,the Canary Current will （）.
A pilot vessel on pilotage duty at night will show sidelights and a sternlight （）.
An occulting light is one in which （）.
Lateral movement of the vessel to leeward of its course defines （）.