单项选择题
To obtain accuracy in fixing by DF cross bearings，（）should be used.
A.two stations，including one on the nearest coast B.two stations，including one on the nearer coast C.three stations，including one on the farthest coast D.three stations，including one on the nearest coast
单项选择题 To obtain accuracy in fixing by DF，（）and three stations should be used.
单项选择题 Vessels in port may use（）for receiving typhoon warnings during the typhoon season.
单项选择题 We’ll see（）the compasses are in good condition.
