單項選擇題If the situation arose where it became necessary to tow a disabled vessel,which statement is TRUE concerning the towing line?().

A.The towing line between the two vessels should be clear of the water
B.The towing line should be taut at all times between the vessels
C.There should be a catenary so the line dips into the water
D.None of the above


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1.單項選擇題If a tow sinks in shallow water,you should().

A.release it immediately
B.attempt to beach it before it goes under
C.pay out cable until it's on the bottom and place a buoy on the upper end
D.shorten cable to keep it off the bottom

2.單項選擇題Ice blink is().

A.the dark appearance of the underside of a cloud layer due to reflection of a surface of open water
B.the soft light appearance on the underside of a cloud layer due to reflection from a surface of open water
C.the yellowish-white glare on the underside of a cloud layer
D.water sky

3.單項選擇題For operations in pack ice,a vessel should().

A.be on an even keel
B.be trimmed slightly by the head
C.have a drag of not more than 60 - 90 centimeters
D.be ballasted so the forefoot is near the surface

4.單項選擇題Before entering an ice area,the ship should be().

A.either trimmed by the head or the stern
B.on an even keel
C.trimmed down by the head
D.trimmed down by the stern

5.單項選擇題Any vessel shall,if the circumstances of the case admit,avoid()in a narrow channel.

A.anchor
B.to anchor
C.anchoring
D.to anchoring