Especially in adverse weather，risk of collision with an offshore supply vessel increases when the vessel is moored to what side of the unit?（）.

单项选择题Early indications of the approach of a hurricane may be all of the following EXCEPT（）.

A.short confused swells
B.gradually increasing white clouds (mare's tails)
C.pumping barometer
D.continuous fine mist-like rain

单项选择题Cirrus clouds are composed primarily of（）.

A.ice crystals
B.water droplets
C.snow crystals
D.nitrogen

单项选择题An aneroid barometer reading should be corrected for differences in（）.

A.elevation
B.temperature
C.wind speed
D.latitude

单项选择题An anemometer on a moving vessel measures（）.

A.apparent wind speed only
B.true wind speed and true wind direction
C.true wind speed only
D.apparent wind speed and true wind direction

单项选择题Altocumulus clouds are defined as（）.

A.high clouds
B.middle clouds
C.low clouds
D.vertical development clouds