The distance traveled by the center of gravity perpendicular to the original course is（）.

单项选择题The rule state that a vessel overtaking another vessel is relieved of her duty to keep clear when（）.

A.she is forward of the other vessel’s beam
B.the overtaking situation become crossing situation
C.She is past and clear of the other vessel
D.the other vessel is no longer in sight

单项选择题If a hurricane several hundred miles away is moving in your general direction your barometer would（）.

A.start to rise rapidly
B.start to fall gradually
C.rise slowly,begin pumping and then start a slow,steady fall
D.remain steady

单项选择题（）locates in the aftmost part of a ship.

A.forecastle
B.cargo hold
C.rudder
D.propeller

单项选择题What is TRUE when operating in fog and other vessels are detected by radar?（）

A.you should make an ample change to port for a vessel crossing on the starboard bow
B.You should maneuver in ample time if a close-quarters situation is developing
C.You should determine the course and speed of all radar contacts at six minutes intervals
D.Long-range scanning will provide early warning of all other vessels within the radar’s range

单项选择题What occurs when rising air cools the dew point?（）

A.advection fog forms
B.humidity decrease
C.wind increase
D.Cloud form