单项选择题

A psychrometer has two thermometers that provide dry bulb and wet bulb temperatures. By comparing these two temperature readings with a set of tables you can determine the （）.

A.atmospheric pressure
B.wind speed
C.relative humidity and dew point
D.wind chill factor

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A predictable result of a vessel nearing a bank or edge of a channel is that the（）.

A.stern is drawn to the bank as the bow sheers off
B.bow sheers toward the bank
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D.vessel will be drawn bodily into the bank unless the engines are stopped

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A position that is obtained by using two or more intersecting lines of position taken at nearly the same time，is a(n) （）.

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D.dead-reckoning position