单项选择题
How is the annual rate of change for magnetic variation shown on a pilot chart?（）
A.Gray lines on the uppermost inset chart
B.Red lines on the main body of the chart
C.In parenthesis on the lines of equal magnetic variation
D.Annual rate of change is not shown
相关考题
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单项选择题
How is a safe water mark，that can be passed close aboard on either side，painted and lighted?（）
A.Black and white stripes with an interrupted quick flashing light
B.Black and red stripes with a Morse (A) light
C.Black and red stripes with an interrupted quick flashing light
D.Red and white stripes with a Morse (A) light -
单项选择题
How does the effect known as “bank suction” act on a single-screw vessel proceeding along a narrow channel?（）
A.It pulls the stern toward the bank
B.It heels the vessel toward the bank
C.It pushes the entire vessel away from the bank
D.It pulls the bow toward the bank -
单项选择题
How does foam extinguish an oil fire?（）
A.By cooling the oil below the ignition temperature
B.By removing the fuel source from the fire
C.By excluding the oxygen from the fire
D.By increasing the weight of the oil
