单项选择题
Which of the following statements is TRUE regarding crane operations（）.
A.Radio communications allow the crane operator to disregard the use of hand signals
B.The crane operators and signalman must be familiar with the correct hand signals
C.The forward cranes can be operated from the bridge
D.The aft cranes can be operated from the aft steering station
相关考题
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单项选择题
Which of the following statements is TRUE regarding automatic identification systems（AIS）（）.
A.AIS is a global tracking system that relies upon INMARSAT C service to communicate vessel position and other safety related information to similarly equipped vessels，aircraft and shore stations within the area
B.AIS is a short-range 3 cm X-band radar system that automatically sends a vessel's position and other safety related information to similarly equipped vessels，aircraft and shore stations within the area
C.AIS is a short-range VHF-FM system that automatically broadcasts a vessel's position and other safety related information frequently to similarly equipped vessels，aircraft and shore stations within the area
D.AIS is a one-way centrally managed system that requires the local VTS to send commands to instruct each vessel to broadcast position and other safety related information to similarly equipped vessels，aircraft and shore stations within the area -
单项选择题
When your vessel is proceeding to the area of traffic density，（）is used to determine the exact ranges of other ships or objects in the vicinity.
A.Radar
B.GPS
C.DF
D.Satellite Navigator -
单项选择题
When navigating using DGPS（Differential Global Positioning System）you may expect your position to be accurate to within a radius of（）.
A.10 meters
B.20 meters
C.50 meters
D.100 meters
