单项选择题
A.Straight line B.Arc C.Parabola D.Hyperbola
A quick and rapid motion of a ship in a seaway is an in...
单项选择题A quick and rapid motion of a ship in a seaway is an indication of a(n) （）.
A.large GM B.high center of gravity C.excessive free surface D.small GZ
A pumproom is suspected of accumulating gases after a v...
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
A psychrometer has two thermometers that provide dry bu...
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
