单项选择题
A slow，gradual fall of the barometer indicates approaching（）.
A.gale force winds within 12 hours B.blizzard conditions C.deteriorating or unsettled weather D.heavy，wind driven rain
单项选择题 A slow rise in the barometric pressure forecasts（）.
单项选择题 A sling psychrometer is used to measure（）.
单项选择题 A situation has occurred where it becomes necessary for you to be towed. What action should be taken to prevent your vessel from yawing?（）
