单项选择题

A.A flashing light combined with a fixed light of great……

On navigational aids，what does the light characteristic Fl(2+1) mean?（）

A.A flashing light combined with a fixed light of greater brightness
B.Light flashes combined in groups，with a different number of flashes in each group
C.A light showing groups of two or more flashes at regular intervals
D.A fixed light varied at regular intervals by groups of two or more flashes of greater brightness

<上一题目录下一题>

热门试题

单项选择题On cargo booms，preventers are（）.

A.auxiliary guys
B.extra fair leads
C.steel bands
D.stops

单项选择题Mechanical gearing of deck machinery such as the windlass or boat hoists should（）.

A.be open to view so，if a foreign object gets in the gearing，the operator can immediately stop the machinery
B.have a guard over the gearing
C.be painted a contrasting color from the base color in order to call attention to the gearing
D.not be operated if there is any crew within 10 feet of the machinery

单项选择题Lines or gear NOT in use should be（）.

A.conspicuously marked
B.stowed anywhere
C.left on deck
D.secured or stowed out of the way

单项选择题Laying out a line in successive circles flat on deck with the bitter end in the center is known as（）.

A.coiling
B.faking
C.flemishing
D.lining

单项选择题In plugging submerged holes on a vessel，rags，wedges，and other materials should be used in conjunction with plugs to（）.

A.reduce the water pressure on the hull
B.reduce the water leaking around the plugs
C.prevent progressive flooding
D.reduce the possibility of stress fractures