A.one and one-half times the length of a dotB.twice the……

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

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

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

单项选择题The following（）is a standard phrase.

A.I may enter fairway
B.I might enter fairway
C.INTENTION. I will enter fairway
D.I will probably enter fairway

单项选择题The Departure Report，required by vessels participating in AMVER，must be sent（）.

A.as soon as practicable on leaving port
B.prior to departure
C.within 24 hours of departure
D.within 12 hours of departure