单项选择题
A.lower than actually exists B.higher than actually exists C.that actually exists D.that has no proportional relationship
A.a greatly reduced wind speed B.a higher wind speed than what really exists C.a lower wind speed than what really exists D.more turbulent winds
A.go in one direction until the fuel runs out B.steer a course for the nearest land C.steer a course for the nearest sea lane D.shut down the engines if installed and put out the sea anchor