A.prior to
B.during
C.in the period of
D.afterwards
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A.actual depth of water
B.actual depth of water below keel
C.average depth from waterline to hard bottom
D.average depth of water to soft bottom
A.prevent them from falling when the vessel rolls
B.protect personnel from electrical shock
C.increase their operating efficiency
D.prevent unauthorized personnal from operating them
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A tide is called diurnal when（）.
Where would you find information about the time of high tide at a specific location on a particular day of the year?（）
The force resulting from the earth’s rotation that causes winds to deflect to the right in the Northern Hemisphere and to the left in the Southern Hemisphere is called（）.
Which of the following is not an operation mode of AIS?（）
In the Northern hemisphere northerly winds may cause temperature（）.