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單項(xiàng)選擇題

ANCHOR HAS ITS OWN CABLE TWISTED AROUND IT defines（）.

A.foul of anchor
B.dropping anchor
C.weighing anchor
D.walking back anchor

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單項(xiàng)選擇題

（）sends a radio signal from the bottom of the ship to the sea-bed,from which it is reflected.

A.The marine sextant
B.The chronometer
C.The echo sounder
D.The radar

單項(xiàng)選擇題

The ARPA may swap targets when automatically tracking if two targets（）

A.are tracked on reciprocal bearings
B.are tracked at the same range
C.are tracked on the same bearing
D.pass closely to each other

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