97免费在线观看视频,亚洲综合自拍网,黄色毛片免费观看,热久久综合网,免费看日产一区二区三区狠狠操av,久久久涩涩涩,在线精品免费视频,人人插天天干,久久91精品国产91久久

<del id="ipqzk"><b id="ipqzk"><thead id="ipqzk"></thead></b></del>

單項選擇題

When out of sight of land, a ship’s position can be found by using（）.

A.the coastal navigation
B.the celestial navigation
C.traditional navigation
D.the great circle navigation

你可能感興趣的試題

單項選擇題

When visibility is reduced to about 5 miles, we say that visibility is（）.

A.very good
B.good
C.poor
D.moderate

單項選擇題

When your vessel is proceeding to the area of traffic density,（）is used to determine the exact ranges of other ships or objects in the vicinity.

A.radar
B.GPS
C.DF
D.satellite navigator

<optgroup id="o4cia"></optgroup>

<track id="o4cia"><address id="o4cia"></address></track>

<strong id="o4cia"></strong>