单项选择题
A.one and one-half times the length of a dot B.twice the length of a dot C.three times the length of a dot D.four times the length of a dot
The range of a SSB transmission is MOST affected by（）.A...
单项选择题The range of a SSB transmission is MOST affected by（）.
A.atmospheric noise and radiated power B.the frequency band selected and time of day or night C.interference and position of the moon D.radiated power and nearness to shore
The light rhythm of Morse (A) is shown on（）.A.preferred...
单项选择题The light rhythm of Morse (A) is shown on（）.
A.preferred-channel buoys B.starboard- or port-side buoys C.special marks D.safe water buoys
The following（）is a standard phrase.A.You may enter fai...
单项选择题The following（）is a standard phrase.
A.You may enter fairway B.You should enter fairway C.ANSWER. It is permitted to enter fairway D.You could enter fairway
