A.vessel laying cable
B.vessel towing a submerged object
C.vessel not under command
D.air cushion vessel
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A.Opening and closing the throttle
B.Rocking the wings
C.Flashing the navigational lights off and on
D.Flashing Morse T
A.has long life
B.is light weight
C.absorbs shock
D.has fine adjustment
A.increase the towing hawser's catenary and provide more spring
B.reduce catenary，allow operation in shallower water，and to release one barge without breaking up the entire tow
C.enable one tug and its crew without any outside assistance to make up or break down the tow
D.provide rapid delivery of logs from the northwestern United States to Hawaiian sawmills
A.only when the load is taken off the cable
B.only when there is a load on the cable
C.only when activated by the controls at the lowering station
D.at any time
A.Cirrus
B.Cumulus
C.Stratus
D.Nimbus
最新試題
All portable fire extinguishers must be capable of being（）.
An icebreaker may use the code letter “K” to remind ships of their obligation to listen continuously on their radio. This signal may be made by any of the following EXCEPT（）.
An entry of water，gas，oil，or other formation fluid into the wellbore is called a（）.
All Loran-C transmitting stations are equipped with cesium frequency standards which permit （）.
Aids to navigation marking the intracoastal waterway can be identified by（）.
An example of a grade C product is（）.
All personnel on board a vessel should be familiar with the rescue boat’s（）.
An inflatable liferaft is floating in its container，attached to the ship by its painter，as the ship is sinking rapidly. Which action should be taken with respect to the liferaft container? （）
An icebreaker displaying a flag hoist which consists of the code letters “WO” (Whiskey Oscar) is indicating that（）.
An aneroid barometer on a boat should always be（）.