单项选择题
A.In the lower level of the pumproom
B.In the middle level of the pumproom
C.In the upper level of the pumproom
D.On the deck outside the pumproom
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 （）.
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 （） .