单项选择题

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

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单项选择题
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
单项选择题
In mid-ocean，the characteristics of a wave are determined by three factors. What is NOT one of these factors?（）.

A.Effect of the moon's gravity
B.Fetch
C.Wind velocity
D.Length of time a wind has been blowing
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