单项选择题

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

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单项选择题

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

单项选择题

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

单项选择题

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