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單項選擇題

In shallow water，waves that are too steep to be stable，causing the crests to move forward faster than the rest of the wave，are called（）.

A.rollers
B.breakers
C.white caps
D.surfers

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單項選擇題

In most cases，the direction of the apparent wind lies between the bow and（）.

A.the direction of the true wind
B.true north
C.the beam on the windward side
D.the beam on the lee side

單項選擇題

In modern fathometers the sonic or ultrasonic sound waves are produced electrically by means of a(n)（）.

A.transmitter
B.transducer
C.transceiver
D.amplifier

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