A.in
B.on
C.with
D.by
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A.is decreased
B.decreased
C.decreases
D.are decreased
A.vertical distance from the tidal datum to the ocean bottom plus the height of the tide
B.vertical distance from the tidal datum to the ocean bottom
C.average height of water over a specified period of time
D.average height of all low waters at a place
A.capital letters
B.italics
C.boldface print
D.underlined letters
A.conspicuous
B.inconspicuous
C.a government facility or station
D.a radio transmitter
A.does not change
B.improves rapidly
C.improves only slightly
D.becomes poor
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On notification by Admiralty Notice to Mariners that a new edition of one of the books，or a new supplement to one，has been published，it should be obtained（）.
The best estimate of the wind direction at sea level can be obtained from observing the direction of the（）.
Which is the correct procedure for anchoring a small to medium size vessel in deep water （）.
Weekly Notices are dated for the（）appropriate to the week they are issued on the UKHO website.
The charts show two dashed lines crossing the river justsouth of St. Catherine Bar Light. What does this indicate? （）
Generally，（）are used as the track charts on the high sea，（）are used for harbors，inland waters and coastal areas．
Information for updating nautical charts is primarily found in the（）.
On the approach of a warm front the barometric pressure usually（）.
SEARCHABLE NOTICES TO MARINERS can be searched by all the following options except（）.
On a nautical chart，the inner ring of a compass rose indicates（）.