A、change from smooth curves within the air mass to sharp bends at the front
B、change from sharp bends within the air mass to smooth curves at the front
C、pass smoothly across the front with no change
D、become closer together at the front and pass through in straight lines
更多“When crossing a front,isobars tend to（）.”相关的问题
A、At any time you feel it is appropriate B、Only when you have reached extremis C、When you determine that your present course will cross ahead of the other vessel D、When it becomes apparent to you that the give-way vessel is not taking appropriate action
A、A.cross the channel as you are the stand-on vessel B、B.cross only if the vessel in the channel is approaching on your port side C、C.not cross the channel if you might impede the other vessel D、D.sound the danger signal
A、When a risk of collision exists B、When action by the give-way vessel alone will not prevent a collision C、When the bearing to give-way vessel becomes steady D、When the vessels become less than 1/2 mile apart
A、crossing your course in the same direction B、crossing your course in opposite directions C、parallel to the pier from ahead D、setting you on the pier
A、in a crossing situation B、when they are making more speed than the power-driven vessel C、when the sailing vessel is overtaking D、on the Inland Waters of the United States
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