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单选题
What is the purpose of the equalizing beam aboard a crane vessel（）.
A
It allows for rotation of the hook in the single mode
B
It is required to“twin-up”30-ton pedestal cranes
C
It is used to pick up light loads
D
It is used to rigidly connect two cranes
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更多 “单选题What is the purpose of the equalizing beam aboard a crane vessel（）.A It allows for rotation of the hook in the single modeB It is required to“twin-up”30-ton pedestal cranesC It is used to pick up light loadsD It is used to rigidly connect two cranes” 相关考题
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考题
单选题The purpose of inert gas systems aboard tank vessels is to（）.A
allow sufficient oxygen in the tank to sustain lifeB
prevent outside air from entering the tankC
provide increase in cargo discharge pressureD
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Stopping the boomB
Topping or lowering the boomC
Moving the boom left or rightD
All of the above
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allow sufficient oxygen in the tank to sustain lifeB
prevent outside air from entering the tankC
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vertical positionB
horizontal positionC
boom stop angleD
minimum radius angle
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