單項(xiàng)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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1.單項(xiàng)選擇題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

2.單項(xiàng)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

3.單項(xiàng)選擇題A position that is obtained by using two or more intersecting lines of position taken at nearly the same time，is a(n) （）.

A.fix
B.running fix
C.estimated position
D.dead-reckoning position

4.單項(xiàng)選擇題A position that is obtained by applying estimated current and wind to your vessel’s course and speed is a(n) （）.

A.estimated position
B.dead reckoning position
C.fix
D.None of the above

5.單項(xiàng)選擇題A position obtained by crossing lines of position taken at different times and advanced to a common time is a(n) （）.

A.dead-reckoning position
B.running fix
C.estimated position
D.fix