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
单项选择题 A predictable result of a vessel nearing a bank or edge of a channel is that the（）.
单项选择题 A precaution you should take before bunkering is to （） .
单项选择题 A position that is obtained by using two or more intersecting lines of position taken at nearly the same time，is a(n) （）.
