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单选题
Areas which cannot be scanned by the radar of the vessel because they are shielded by parts of its superstructure, masts,etc means（）.
A
blind sectors
B
sheltered area
C
unseen area
D
unscan ble area
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单选题An indirect radar echo is caused by a reflection of the main lobe of the radar beam off the observer’s vessel. Which of the following is NOT a characteristic of indirect echoes?（）.A
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考题
单选题AREAS WHICH CANNOT BE SCANNED BY THE RADAR OF THE VESSEL BECAUSE THEY ARE SHIELDED BY PARTS OF ITS SUPERSTRUCTURE，MASTS，ETC means（）.A
Blind sectorsB
Sheltered areaC
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Unscanable area
考题
单选题Which statement concerning maneuvering in restricted visibility is FALSE?（）.A
A vessel which cannot avoid a close-quarters situation with a vessel forward of her beam shall reduce her speed to bare steeragewayB
A vessel which hears a fog signal forward of her beam shall stop her enginesC
A vessel which hears a fog signal forward of the beam shall navigate with cautionD
If a vessel determines by radar that a close-quarters situation is developing，she shall take avoiding action in ample time
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sound the danger signalB
when taking action, make only course changesC
avoid altering course toward a vessel abaft the beamD
All of the above
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单选题Which of the following radar contacts will present the most immediate danger?（）.A
A vessel on the starboard bow whose bearing is changing and range is decreasingB
A vessel on the starboard bow whose bearing is steady and range is increasingC
A vessel on the port bow whose bearing is steady and range is decreasingD
A vessel on the port bow whose bearing is changing to the left and range decreasing
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单选题Which statement is TRUE concerning a vessel equipped with operational radar?（）.A
She must use this equipment to obtain early warning of risk of collisionB
The use of a radar excuses a vessel from the need of a look-outC
The radar equipment is only required to be used in restricted visibilityD
The safe speed of such a vessel will likely be greater than that of vessels without radar
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