The duty of a deck winch is to lift and lower a load by mean

When a cargo boom or crane is rated at varying capacities，there will be a table at the controls which relates safe working load to ______．

A.winch speed

B.boom strength

C.load radius

D.cable strength

材料：

An aircraft lift on board RFA Argus was loaded beyond its safe working load of 18.4 tonnes．There were no injuries to any personnel，or material damage to the ship or its equipment．

During a planned stay in port，500 compressed CO2 cylinders were required to be landed．These were normally stowed on a lower deck and needed to be transferred to the weather deck before being taken ashore．Before the vessel&39;s arrival in port，the planned operation was discussed between various officers and senior ratings，one of whom was to supervise final discharge of the cylinders from the ship．

Once in port，a senior rating gave instructions to three juniors to transfer a number of cylinders to the weather deck．He then left them alone to load the cylinders onto the platform. of an aircraft lift．The cylinders weighed 19.95 tonnes，which was greater than they had been instructed to load．In addition to this excess weight they added a fork lift truck weighing 5.5 tonnes．The lift was then raised．

When it reached the weather deck，the lift was unable to stow at the correct level．When investigated it was discovered that the load of both CO2 bottles and the fork lift truck was greater than its safe working load（SWL）and this had prevented the locking cleats at the flight deck（weather deck）engaging．

问题：

The lift was taken out of service for testing and inspection． The safe working load of the aircraft lift is ________ tonnes．

A.18.4

B.19.95

C.5.5

D.500

The aircraft lift was overloaded by a weight which is ________ more than its SWLA.1.55

B.3.95

C.5.5

D.7.05

It is implied in the passage that ________．A.the lift should be raised slowly to avoid the accident

B.the aircraft lift on board RFA Argus should be driven by super power

C.the senior rating should give instructions in more detail to the three juniors to transfer a number of cylinders to the weather deck

D.if the unloading operation was supervised by an officer who has sufficient experience of the loads，lifting equipment and the overall operation，the accident would had been avoided

It was the ________ that had prevented the locking cleats at the flight deck（weather deck）engaging．A.fork lift

B.CO2 bottles

C.overloaded weight

D.the three juniors

请帮忙给出每个问题的正确答案和分析，谢谢！

The soundings on the chart are based on the depth of water available at ______.

A.mean low water

B.mean lower low water

C.mean high water

D.mean high water springs

If an electric cargo winch is being used to lift a draft of cargo and the engine room loses all power，which will occur ________．

A.A pawl，forced by a spring mechanism，will engage the teeth of the bull gear and hold the load

B.An electromagnetic brake will hold the load where it is suspended

C.The load will fall rapidly to the deck unless the foot brake is engaged

D.The load will slowly lower to the deck under control of the drag of the winch motor

If an attempt is made to hoist a load that exceeds the capacity of an electric winch，an overload safety device causes a circuit breaker to cut off the current to the winch motor ______．

A.when the line pull reaches the rated winch capacity

B.after the line pull exceeds the rated winch capacity

C.after a short build-up of torque

D.immediately