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

單項(xiàng)選擇題

Radar is of great help to ship in poor（）(能見度).

A.visibility
B.VHF
C.visible
D.compass

你可能感興趣的試題

單項(xiàng)選擇題

Navigators use navigational aids, such as（）（羅經(jīng)）.

A.sextant
B.binoculars
C.compass
D.loran

單項(xiàng)選擇題

（）（電羅經(jīng)）can tell us true north.

A.VHF
B.Radar
C.Chart
D.Gyro-compass