單項選擇題

A psychrometer has two thermometers that provide dry bulb and wet bulb temperatures. By comparing these two temperature readings with a set of tables you can determine the （）.

A.atmospheric pressure
B.wind speed
C.relative humidity and dew point
D.wind chill factor

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A predictable result of a vessel nearing a bank or edge of a channel is that the（）.

A.stern is drawn to the bank as the bow sheers off
B.bow sheers toward the bank
C.vessel continues in a straight line，but with greatly reduced maneuverability
D.vessel will be drawn bodily into the bank unless the engines are stopped

單項選擇題

A precaution you should take before bunkering is to （） .

A.plug the vents
B.plug the sounding pipes
C.plug the scuppers
D.close the lids on the vents