單項(xiàng)選擇題An oiler was badly burned and you are communicating with a passenger ship that has a doctor and hospital on board. You want to rendezvous in a certain position so the oiler can be evacuated for medical treatment. Which code should your message contain?（）

A.MAF
B.MAB
C.MAA
D.MAE


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A.a line on a weather map connecting equal points of both temperature and pressure
B.an instrument that measures the climatological effects of temperature
C.a line connecting points of equal barometric pressure on a weather map
D.a line connecting points of equal temperature on a weather map

2.單項(xiàng)選擇題An intermediate spring is（）.

A.fitted in each leg of the towing bridle
B.generally located between the "fishplate" and the main towing hawser
C.secured at the "H" bitts
D.usually made of manila hawser

3.單項(xiàng)選擇題An instrument that maintains a continuous record of humidity changes is called a（）.

A.thermometer
B.barometer
C.hygrograph
D.thermograph

4.單項(xiàng)選擇題An instrument that indicates wind direction is known as a(n)（）.

A.weather vane，wind vane or wind sock
B.hydrometer
C.hygrometer
D.sling psychrometer

5.單項(xiàng)選擇題All of the following steps are taken in starting a centrifugal pump，EXCEPT to（）.

A.set the relief valve
B.check the lubrication system
C.vent the pump casing
D.open the pump suction and discharge valves