單項選擇題

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

你可能感興趣的試題

單項選擇題

On cargo booms，preventers are（）.

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

單項選擇題

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

无码高清视频|成人自拍视频|欧美成人午夜无码A片秀色直播|草美女视频网站|美女被操网站在线观看

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

你可能感興趣的試題

On cargo booms，preventers are（）.

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

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

On cargo booms，preventers are（）.