单项选择题
A.low barometric pressure B.high barometric pressure C.falling barometric pressure D.pumping barometric pressure
A.high pressures B.low pressures C.weak pressures D.strong pressures
A.check it with a barometer on another vessel B.take readings from several barometers and average them C.check it with the barometer at the ship chandlery D.check it against radio or National Weather Service reports of the immediate vicinity