单项选择题
Chart legends which indicate a conspicuous landmark are printed in（）.
A.underlined letters B.capital letters C.italics D.boldface print
单项选择题 Chart legends printed in capital letters show that the associated landmark is（）.
单项选择题 Channel 13 is primarily used for ship to ship communication. Channel 13 is also authorized for（）.
单项选择题 Changing rescuers while carrying out artificial respiration should be done（）.
