A.large GMB.high center of gravityC.excessive free surf……

单项选择题A pumproom is suspected of accumulating gases after a ventilation machinery breakdown. Where should the combustible gas indicator case be placed when testing the pumproom atmosphere for combustible gases? （）

A.In the lower level of the pumproom
B.In the middle level of the pumproom
C.In the upper level of the pumproom
D.On the deck outside the pumproom

单项选择题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

单项选择题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

单项选择题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

单项选择题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