单项选择题
A.athwart B.on end C.bilge and cantline D.bed
Which of below device has the maximum coverage range（）A...
单项选择题Which of below device has the maximum coverage range（）
A.AIS B.Radar C.VHF D.LRIT
We took usual steps:sounding the depth, reversing and s...
单项选择题We took usual steps:sounding the depth, reversing and stopping engine,paying out anchor and 60 fathoms of chain cable in the depth of 12 fathoms.The operation above is（）.
A.berthing B.searching C.anchoring D.picking up pilot
Which of the following is not a factor which can interf...
单项选择题Which of the following is not a factor which can interfere with the pulse of sound and cause a variation the depth reading?（）
A.salinity B.temperature C.the hydrostatic pressure D.Vessel’s speed
