你可能感興趣的試題

單項(xiàng)選擇題

The time required for a lighted aid to complete a full cycle of light changes is listed in the Light List as the（）.

A.Set
B.Frequency
C.Period
D.Function

單項(xiàng)選擇題

The recording fathometer produces a graphic record of the（）.

A.bottom contour only up to depths of 100 fathoms
B.depth underneath the keel against a time base
C.contour of the bottom against a distance base
D.depth of water against a distance base