单项选择题
Charted depth is the（）.
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
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相关考题
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单项选择题
Chart legends which indicate a conspicuous landmark are printed in（）.
A.capital letters
B.italics
C.boldface print
D.underlined letters -
单项选择题
Chart legends printed in capital letters show that the associated landmark is（）.
A.conspicuous
B.inconspicuous
C.a government facility or station
D.a radio transmitter -
单项选择题
After the passage of a cold front the visibility（）.
A.does not change
B.improves rapidly
C.improves only slightly
D.becomes poor
